Make uploader_url column nullable

app/src/main/java/org/schabi/newpipe/database/Migrations.java

@@ -165,7 +165,7 @@ public final class Migrations {
         @Override
         public void migrate(@NonNull final SupportSQLiteDatabase database) {
             database.execSQL(
-                    "ALTER TABLE streams ADD COLUMN uploader_url TEXT NOT NULL default ''"
+                    "ALTER TABLE streams ADD COLUMN uploader_url TEXT"
             );
         }
     };

app/src/main/java/org/schabi/newpipe/database/playlist/PlaylistStreamEntry.kt

@@ -27,7 +27,7 @@ data class PlaylistStreamEntry(
         val item = StreamInfoItem(streamEntity.serviceId, streamEntity.url, streamEntity.title, streamEntity.streamType)
         item.duration = streamEntity.duration
         item.uploaderName = streamEntity.uploader
-        item.uploaderUrl = streamEntity.uploaderUrl
+        item.uploaderUrl = streamEntity.uploaderUrl ?: ""
         item.thumbnailUrl = streamEntity.thumbnailUrl
 
         return item

app/src/main/java/org/schabi/newpipe/database/stream/model/StreamEntity.kt

@@ -47,7 +47,7 @@ data class StreamEntity(
     var uploader: String,
 
     @ColumnInfo(name = STREAM_UPLOADER_URL)
-    var uploaderUrl: String,
+    var uploaderUrl: String? = null,
 
     @ColumnInfo(name = STREAM_THUMBNAIL_URL)
     var thumbnailUrl: String? = null,