Remove invaild catches from replayer

[ma2ciek]

These catches should be changed in order to provide some correct errors.

[Reinmar]

They are rather unnecessary – if the function return a promise it's usually enough when the caller handles errors.

[ma2ciek]

They were designed to handle errors from the applyNextDelta method as I didn't notice that this may conflict with the errors coming from the engine

[Reinmar]

OK, so this goes a bit beyond my knowledge of this code and its application. So, my only point remains that there should be no silent catches. The rest is up to you :)

[ma2ciek]

I changed the applyNextDelta method and now it resolves also when there is no delta to replay. Thus, the methods that uses applyNextDelta can correctly capture the engine errors, e.g. the play method (test).