Fix if no editing target

src/containers/sound-tab.jsx

@@ -57,12 +57,12 @@ class SoundTab extends React.Component {
             onNewSoundFromRecordingClick
         } = this.props;
 
-        const sprite = vm.editingTarget.sprite;
-
-        if (!sprite) {
+        if (!vm.editingTarget) {
             return null;
         }
 
+        const sprite = vm.editingTarget.sprite;
+
         const sounds = sprite.sounds ? sprite.sounds.map(sound => (
             {
                 url: soundIcon,