conversation: catch exceptions stopping player

Change-Id: If02f950801e9601e31083b6d761420c0cac64d4c

ring-android/app/src/main/java/cx/ring/adapters/ConversationAdapter.java

@@ -312,9 +312,13 @@ public class ConversationAdapter extends RecyclerView.Adapter<ConversationViewHo
             holder.surface = null;
         }
         if (holder.player != null) {
+            try {
                 if (holder.player.isPlaying())
                     holder.player.stop();
                 holder.player.reset();
+            } catch (Exception e) {
+                // left blank intentionally
+            }
             holder.player.release();
             holder.player = null;
         }