When Wwise Gem is not enabled, this will fix a nullptr deref crash when
interacting with Audio Controls Editor.
Also fixes another issue in the same function where getting the current
level name was garbage because a temporary QString was created and
immediately destructed.
Updates to some AzCore functions a while ago made some path functions
strip off a trailing slash, which caused bad paths to be used when
loading middleware data. Updated the code to use better path APIs.
Eric Phister
Steve Pham
alexpete