Ignore play() when called before init()

If an error occurs during startup, then it's possible that we'll try to call sound.play('ERROR') in the error handler, which will throw an exception. Instead, just don't play sounds in this case.

src/renderer/lib/sound.js

@@ -55,6 +55,10 @@ function init (appState) {
 }
 
 function play (name) {
+  if (state == null) {
+    return
+  }
+
   if (!state.saved.prefs.soundNotifications) {
     return
   }