fix issue #1089 (assert in MorphTrack.setKeyframes() fails)

jme3-core/src/main/java/com/jme3/anim/MorphTrack.java

@@ -128,8 +128,6 @@ public class MorphTrack implements AnimTrack<float[]> {
             }
 
             this.weights = weights;
-
-            assert times.length == weights.length;
         }
     }