audio_music: log the reason why mixer could not be created #4168
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On NixOS SDL2_mixer was not configured fully against timidity,
but it was not immediately clear:
10:02:38: [ERROR] PlayMusic: music parameter was NULL
With the patch error reporting is more straightforward:
10:03:45: [ERROR] Play: Couldn't open /etc/timidity/freepats.cfg
The change makes error handling in
void Music::Play( const std::vector<uint8_t> & v, const bool loop )
void Music::Play( const std::string & file, const bool loop )
identical.