Only play preview video if media was parsed

In cases where the selected media file was invalid,
there is no reason to attempt to launch the video
preview.

Author: brarcher

app/src/main/java/protect/videotranscoder/activity/MainActivity.java

@@ -1299,9 +1299,6 @@ public void onNothingSelected(AdapterView<?> parentView)
 
     private void setSelectMediaFile(String path, String overrideBaseName)
     {
-        videoView.setVideoPath(path);
-        videoView.start();
-
         videoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener()
         {
             @Override
@@ -1402,6 +1399,8 @@ public void onResult(MediaInfo result)
 
                 if(result != null)
                 {
+                    videoView.setVideoPath(uri);
+                    videoView.start();
 
                     videoInfo.setFileBaseName(overrideBaseName);
                     populateOptionDefaults();