优化:避免GetEntity右键点击后返回错误的状态

src/Editor/GetEntityServices.ts

@@ -133,7 +133,8 @@ export class GetEntityServices implements EditorService
                 this.Cancel();
                 break;
             default:
-                this.Retun({ Status: PromptStatus.Keyword, StringResult: res.StringResult });
+                if (res.StringResult !== undefined)
+                    this.Retun({ Status: PromptStatus.Keyword, StringResult: res.StringResult });
                 break;
         }
     }