Don't try to obtain HTML5 audio if there is no audio support

Fixes goldfire#1191

Author: goldfire

src/howler.core.js

@@ -2202,7 +2202,7 @@
         self._node.gain.setValueAtTime(volume, Howler.ctx.currentTime);
         self._node.paused = true;
         self._node.connect(Howler.masterGain);
-      } else {
+      } else if (!Howler.noAudio) {
         // Get an unlocked Audio object from the pool.
         self._node = Howler._obtainHtml5Audio();