Some warnings removed

src/algorithms/tracking/adapters/galileo_e1_dll_pll_veml_tracking.cc

@@ -138,12 +138,14 @@ void GalileoE1DllPllVemlTracking::set_gnss_synchro(Gnss_Synchro* p_gnss_synchro)
 
 void GalileoE1DllPllVemlTracking::connect(gr::top_block_sptr top_block)
 {
-    //nothing to connect, now the tracking uses gr_sync_decimator
+	if(top_block) { /* top_block is not null */};
+	//nothing to connect, now the tracking uses gr_sync_decimator
 }
 
 void GalileoE1DllPllVemlTracking::disconnect(gr::top_block_sptr top_block)
 {
-    //nothing to disconnect, now the tracking uses gr_sync_decimator
+	if(top_block) { /* top_block is not null */};
+	//nothing to disconnect, now the tracking uses gr_sync_decimator
 }
 
 gr::basic_block_sptr GalileoE1DllPllVemlTracking::get_left_block()

src/algorithms/tracking/adapters/galileo_e1_tcp_connector_tracking.cc

@@ -141,12 +141,14 @@ void GalileoE1TcpConnectorTracking::set_gnss_synchro(Gnss_Synchro* p_gnss_synchr
 
 void GalileoE1TcpConnectorTracking::connect(gr::top_block_sptr top_block)
 {
-    //nothing to connect, now the tracking uses gr_sync_decimator
+	if(top_block) { /* top_block is not null */};
+	//nothing to connect, now the tracking uses gr_sync_decimator
 }
 
 void GalileoE1TcpConnectorTracking::disconnect(gr::top_block_sptr top_block)
 {
-    //nothing to disconnect, now the tracking uses gr_sync_decimator
+	if(top_block) { /* top_block is not null */};
+	//nothing to disconnect, now the tracking uses gr_sync_decimator
 }
 
 gr::basic_block_sptr GalileoE1TcpConnectorTracking::get_left_block()

src/algorithms/tracking/adapters/galileo_e5a_dll_pll_tracking.cc

@@ -144,12 +144,14 @@ void GalileoE5aDllPllTracking::set_gnss_synchro(Gnss_Synchro* p_gnss_synchro)
 
 void GalileoE5aDllPllTracking::connect(gr::top_block_sptr top_block)
 {
-    //nothing to connect, now the tracking uses gr_sync_decimator
+	if(top_block) { /* top_block is not null */};
+	//nothing to connect, now the tracking uses gr_sync_decimator
 }
 
 void GalileoE5aDllPllTracking::disconnect(gr::top_block_sptr top_block)
 {
-    //nothing to disconnect, now the tracking uses gr_sync_decimator
+	if(top_block) { /* top_block is not null */};
+	//nothing to disconnect, now the tracking uses gr_sync_decimator
 }
 
 gr::basic_block_sptr GalileoE5aDllPllTracking::get_left_block()

src/algorithms/tracking/adapters/galileo_volk_e1_dll_pll_veml_tracking.cc

@@ -138,12 +138,14 @@ void GalileoVolkE1DllPllVemlTracking::set_gnss_synchro(Gnss_Synchro* p_gnss_sync
 
 void GalileoVolkE1DllPllVemlTracking::connect(gr::top_block_sptr top_block)
 {
-    //nothing to connect, now the tracking uses gr_sync_decimator
+	if(top_block) { /* top_block is not null */};
+	//nothing to connect, now the tracking uses gr_sync_decimator
 }
 
 void GalileoVolkE1DllPllVemlTracking::disconnect(gr::top_block_sptr top_block)
 {
-    //nothing to disconnect, now the tracking uses gr_sync_decimator
+	if(top_block) { /* top_block is not null */};
+	//nothing to disconnect, now the tracking uses gr_sync_decimator
 }
 
 gr::basic_block_sptr GalileoVolkE1DllPllVemlTracking::get_left_block()

src/algorithms/tracking/adapters/gps_l1_ca_dll_fll_pll_tracking.cc

@@ -138,12 +138,14 @@ void GpsL1CaDllFllPllTracking::set_gnss_synchro(Gnss_Synchro* p_gnss_synchro)
 
 void GpsL1CaDllFllPllTracking::connect(gr::top_block_sptr top_block)
 {
-    //nothing to connect, now the tracking uses gr_sync_decimator
+	if(top_block) { /* top_block is not null */};
+	//nothing to connect, now the tracking uses gr_sync_decimator
 }
 
 void GpsL1CaDllFllPllTracking::disconnect(gr::top_block_sptr top_block)
 {
-    //nothing to disconnect, now the tracking uses gr_sync_decimator
+	if(top_block) { /* top_block is not null */};
+	//nothing to disconnect, now the tracking uses gr_sync_decimator
 }
 
 gr::basic_block_sptr GpsL1CaDllFllPllTracking::get_left_block()

src/algorithms/tracking/adapters/gps_l1_ca_dll_pll_optim_tracking.cc

@@ -134,12 +134,14 @@ void GpsL1CaDllPllOptimTracking::set_gnss_synchro(Gnss_Synchro* p_gnss_synchro)
 
 void GpsL1CaDllPllOptimTracking::connect(gr::top_block_sptr top_block)
 {
-    //nothing to connect, now the tracking uses gr_sync_decimator
+	if(top_block) { /* top_block is not null */};
+	//nothing to connect, now the tracking uses gr_sync_decimator
 }
 
 void GpsL1CaDllPllOptimTracking::disconnect(gr::top_block_sptr top_block)
 {
-    //nothing to disconnect, now the tracking uses gr_sync_decimator
+	if(top_block) { /* top_block is not null */};
+	//nothing to disconnect, now the tracking uses gr_sync_decimator
 }
 
 gr::basic_block_sptr GpsL1CaDllPllOptimTracking::get_left_block()

src/algorithms/tracking/adapters/gps_l1_ca_dll_pll_tracking.cc

@@ -134,12 +134,14 @@ void GpsL1CaDllPllTracking::set_gnss_synchro(Gnss_Synchro* p_gnss_synchro)
 
 void GpsL1CaDllPllTracking::connect(gr::top_block_sptr top_block)
 {
-    //nothing to connect, now the tracking uses gr_sync_decimator
+	if(top_block) { /* top_block is not null */};
+	//nothing to connect, now the tracking uses gr_sync_decimator
 }
 
 void GpsL1CaDllPllTracking::disconnect(gr::top_block_sptr top_block)
 {
-    //nothing to disconnect, now the tracking uses gr_sync_decimator
+	if(top_block) { /* top_block is not null */};
+	//nothing to disconnect, now the tracking uses gr_sync_decimator
 }
 
 gr::basic_block_sptr GpsL1CaDllPllTracking::get_left_block()

src/algorithms/tracking/adapters/gps_l1_ca_tcp_connector_tracking.cc

@@ -135,12 +135,14 @@ void GpsL1CaTcpConnectorTracking::set_gnss_synchro(Gnss_Synchro* p_gnss_synchro)
 
 void GpsL1CaTcpConnectorTracking::connect(gr::top_block_sptr top_block)
 {
-    //nothing to connect, now the tracking uses gr_sync_decimator
+	if(top_block) { /* top_block is not null */};
+	//nothing to connect, now the tracking uses gr_sync_decimator
 }
 
 void GpsL1CaTcpConnectorTracking::disconnect(gr::top_block_sptr top_block)
 {
-    //nothing to disconnect, now the tracking uses gr_sync_decimator
+	if(top_block) { /* top_block is not null */};
+	//nothing to disconnect, now the tracking uses gr_sync_decimator
 }
 
 gr::basic_block_sptr GpsL1CaTcpConnectorTracking::get_left_block()