Handle null audio data

lime/audio/AudioBuffer.hx

@@ -71,6 +71,9 @@ class AudioBuffer {
 		#if (cpp || neko)
 		
 		var data = lime_audio_load (path);
+		
+		if (data != null) {
+			
 			var audioBuffer = new AudioBuffer ();
 			audioBuffer.bitsPerSample = data.bitsPerSample;
 			audioBuffer.channels = data.channels;
@@ -78,12 +81,12 @@ class AudioBuffer {
 			audioBuffer.sampleRate = data.sampleRate;
 			return audioBuffer;
 			
-		#else
-		
-		return null;
+		}
 		
 		#end
 		
+		return null;
+		
 	}