add a filter function to the "Add Derivative" menu

source/client/ui/story/DerivativeMenu.ts

@@ -107,6 +107,11 @@ export default class DerivativeMenu extends Popup
         </div>`;
     }
 
+    private hasModel = (node :IAssetEntry)=>{
+        return /\.(gltf|glb|usdz)$/.test(node.info.name)
+            || node.children.some(this.hasModel);
+    }
+
     protected render()
     {
         const language = this.system.getComponent(CVLanguageManager);
@@ -142,7 +147,7 @@ export default class DerivativeMenu extends Popup
                 </div>
                 <div class="ff-splitter-section">
                     <div class="ff-scroll-y">
-                        <ff-asset-tree class="ff-flex-item-stretch" .system=${this.system} path=""></ff-asset-tree>
+                        <ff-asset-tree class="ff-flex-item-stretch" .filter=${this.hasModel} .system=${this.system} path=""></ff-asset-tree>
                     </div>
                 </div>
                 <div class="ff-flex-row sv-centered">

source/client/ui/story/DerivativesTaskView.ts

@@ -103,6 +103,6 @@ export default class DerivativesTaskView extends TaskView<CVDerivativesTask>
             this.model.ins.quality.setValue(quality);
             this.model.outs.updated.set();
             this.system.getMainComponent(CSelection).selectNode(this.model.node);
-        }).catch(e=>Notification.show("Failed to add derivative : "+e.message, "error"));
+        }).catch(e=>{if(e) Notification.show("Failed to add derivative : "+e.message, "error")});
     }
 }
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