Kill hum if all else fails (#384)

Author: NoSloppy

sound/hybrid_font.h

@@ -469,6 +469,9 @@ class HybridFont : public SaberBase, public Looper {
             hum_player_->set_fade_time(0.2);
             hum_player_->FadeAndStop();
             hum_player_.Free();
+          } else {
+            state_ = STATE_HUM_FADE_OUT;
+            hum_fade_out_ = 0.2;
           }
         } else {
           state_ = STATE_HUM_FADE_OUT;