fix(avoid): avoid early return in setSrc

[freeboub]

Summary

Fix issue found in sample
Use case:

• launch sample on android
• channel up until invalid url
• channel down
• Issue: video doesn't restart

Changes

Continue handling setSrc even is player is not allocated

Motivation

@KrzysztofMoch This is more a PR to discuss (even if it really fix the issue).
Don't you think this part of code should be called after reloadSource like in initializePlayerCode :

react-native-video/android/src/main/java/com/brentvatne/exoplayer/ReactExoplayerView.java

Line 628 in f87a793

private void initializePlayerCore(ReactExoplayerView self) {

[KrzysztofMoch]

omg, this surly should be like this ... good catch!

[KrzysztofMoch]

Don't you think this part of code should be called after reloadSource like in initializePlayerCode :

I guess you are right, maybe we can move code that is setting metadata to function to don't duplicate code

[KrzysztofMoch]

I will merge this as it fix problem, will look into moving this to function and call it after reloadSource