Prevent rendering sound editor for non-existant sounds

src/containers/sound-tab.jsx

@@ -38,7 +38,7 @@ class SoundTab extends React.Component {
         const target = editingTarget && sprites[editingTarget] ? sprites[editingTarget] : stage;
 
         if (target && target.sounds && this.state.selectedSoundIndex > target.sounds.length - 1) {
-            this.setState({selectedSoundIndex: target.sounds.length - 1});
+            this.setState({selectedSoundIndex: Math.max(target.sounds.length - 1, 0)});
         }
     }
 
@@ -106,7 +106,7 @@ class SoundTab extends React.Component {
                 onDeleteClick={this.handleDeleteSound}
                 onItemClick={this.handleSelectSound}
             >
-                {target.sounds ? (
+                {target.sounds && target.sounds.length > 0 ? (
                     <SoundEditor soundIndex={this.state.selectedSoundIndex} />
                 ) : null}
                 {this.props.soundRecorderVisible ? (