fix(avoid): avoid early return in setSrc (#3759)

* perf: ensure we do not provide callback to native if no callback provided from app

* chore: rework bufferConfig to make it more generic and reduce ReactExoplayerView code size

* fix(android): avoid easly return in setSrc

android/src/main/java/com/brentvatne/exoplayer/ReactExoplayerView.java

@@ -1646,14 +1646,13 @@ public void setSrc(final Uri uri, final long startPositionMs, final long cropSta
         if (this.customMetadata != customMetadata && player != null) {
             MediaItem currentMediaItem = player.getCurrentMediaItem();
 
-            if (currentMediaItem == null) {
-                return;
-            }
+            if (currentMediaItem != null) {
 
-            MediaItem newMediaItem = currentMediaItem.buildUpon().setMediaMetadata(customMetadata).build();
+                MediaItem newMediaItem = currentMediaItem.buildUpon().setMediaMetadata(customMetadata).build();
 
-            // This will cause video blink/reload but won't louse progress
-            player.setMediaItem(newMediaItem, false);
+                // This will cause video blink/reload but won't louse progress
+                player.setMediaItem(newMediaItem, false);
+            }
         }
 
         if (uri != null) {