fix($animate): do not throw errors if element is removed before animation starts

Closes #10205

Author: matsko

src/ngAnimate/animate.js

@@ -1194,9 +1194,12 @@ angular.module('ngAnimate', ['ng'])
           }
 
           return cache.promise = runAnimationPostDigest(function(done) {
-            var parentElement = element.parent();
-            var elementNode = extractElementNode(element);
-            var parentNode = elementNode.parentNode;
+            var parentNode, parentElement, elementNode = extractElementNode(element);
+            if (elementNode) {
+              parentElement = element.parent();
+              parentNode = elementNode.parentNode;
+            }
+
             // TODO(matsko): move this code into the animationsDisabled() function once #8092 is fixed
             if (!parentNode || parentNode['$$NG_REMOVED'] || elementNode['$$NG_REMOVED']) {
               done();