Add default case form move_clips

Author: JacksonRG

src/timeline/js/directives/clip.js

@@ -331,8 +331,16 @@ App.directive("tlClip", function ($timeout) {
 
           // Move all other selected clips with this one if we have more than one clip
           $(".ui-selected").each(function () {
-            var newY = move_clips[$(this).attr("id")]["top"] + y_offset;
-            var newX = move_clips[$(this).attr("id")]["left"] + x_offset;
+            clip_name = $(this).attr("id");
+            var newX, newY;
+            if (move_clips[clip_name] && ( move_clips[clip_name]['top'] && move_clips[clip_name]['left'] )) {
+              newY = move_clips[clip_name]['top'] = this.style.top + y_offset;
+              newX = move_clips[clip_name]['left'] + y_offset;
+            } else {
+              move_clips[clip_name] =  {};
+              newY = this.style.top + y_offset;
+              newX = this.style.top + y_offset;
+            }
             //update the clip location in the array
             move_clips[$(this).attr("id")]["top"] = newY;
             move_clips[$(this).attr("id")]["left"] = newX;