make sure clip exported with display name

+ fix model exporter test so it passes if we dont export objects that dont have renderers

Author: vkovec

Assets/FbxExporters/Editor/FbxExporter.cs

@@ -2962,7 +2962,7 @@ static void OnClipContextClick(MenuCommand command)
 
                         GameObject animationTrackGObject = UnityEditor.Timeline.TimelineEditor.playableDirector.GetGenericBinding (editorClipAnimationTrack) as GameObject;
 
-                        string filePath = GetExportFilePath (animationTrackGObject.name + "@" + timeLineClip.animationClip.name);
+                        string filePath = GetExportFilePath (animationTrackGObject.name + "@" + timeLineClip.displayName);
                         if (string.IsNullOrEmpty (filePath)) {
                             continue;
                         }
@@ -3027,7 +3027,7 @@ static void OnGameObjectWithTimelineContextClick(MenuCommand command)
                             GameObject atObject = pd.GetGenericBinding(output.sourceObject) as GameObject;
                             // One file by animation clip
                             foreach (TimelineClip timeLineClip in at.GetClips()) {
-                                string filePath = string.Format(AnimFbxFileFormat, folderPath, atObject.name, timeLineClip.animationClip.name);
+                                string filePath = string.Format(AnimFbxFileFormat, folderPath, atObject.name, timeLineClip.displayName);
                                 UnityEngine.Object[] myArray = new UnityEngine.Object[] { atObject, timeLineClip.animationClip };
                                 ExportObjects (filePath, myArray, AnimationExportType.timelineAnimationClip);
 

Assets/FbxExporters/Editor/UnitTests/ModelExporterTest.cs

@@ -468,6 +468,7 @@ public void TestComponentAttributeExport()
 
             var gameObject = new GameObject ();
             var meshFilter = gameObject.AddComponent<MeshFilter> ();
+            gameObject.AddComponent<MeshRenderer> ();
 
             meshFilter.sharedMesh = mesh;