Bug 1464849: Avoid to render the graph in case of animation was removed. r=gl

MozReview-Commit-ID: HREpfImDKum

--HG--
extra : rebase_source : 1b9e0ee2b81fd291bc9d7bbb248ccbfa61b114e2

devtools/client/inspector/animation/components/graph/SummaryGraphPath.js

@@ -184,17 +184,15 @@ class SummaryGraphPath extends Component {
 
   render() {
     const { durationPerPixel, keyframesList } = this.state;
+    const { animation, simulateAnimation, timeScale } = this.props;
 
-    if (!durationPerPixel) {
+    if (!durationPerPixel || !animation.state.type) {
+      // Undefined animation.state.type means that the animation had been removed already.
+      // Even if the animation was removed, we still need the empty svg since the
+      // component might be re-used.
       return dom.svg();
     }
 
-    const {
-      animation,
-      simulateAnimation,
-      timeScale,
-    } = this.props;
-
     const { createdTime, playbackRate } = animation.state;
 
     // If createdTime is not defined (which happens when connected to server older