fix(tests): Add more checks so that test don't error out.

react/features/base/testing/functions.js

     const largeVideoParticipantId = getState()['features/large-video'].participantId;
     const videoTrack = getTrackByMediaTypeAndParticipant(
         getState()['features/base/tracks'], MEDIA_TYPE.VIDEO, largeVideoParticipantId);
-    const lastMediaEvent = getState()['features/large-video'].lastMediaEvent;
+    const lastMediaEvent = getState()['features/large-video']?.lastMediaEvent;
 
     return videoTrack && !videoTrack.muted && (lastMediaEvent === 'playing' || lastMediaEvent === 'canplaythrough');
 }
     const videoTrack = getTrackByMediaTypeAndParticipant(getState()['features/base/tracks'], MEDIA_TYPE.VIDEO, id);
     const lastMediaEvent = videoTrack?.lastMediaEvent;
 
-    return !videoTrack.muted && (lastMediaEvent === 'playing' || lastMediaEvent === 'canplaythrough');
+    return videoTrack && !videoTrack.muted && (lastMediaEvent === 'playing' || lastMediaEvent === 'canplaythrough');
 }