Fix empty path after saving aspect model without aspect

Author: michelu89

core/libs/editor/src/lib/editor-toolbar/services/file-handling.service.ts

@@ -212,7 +212,7 @@ export class FileHandlingService {
 
     this.sidebarService.sammElements.open();
 
-    newRdfModel.absoluteAspectModelFileName = `${emptyNamespace}:${fileName}`;
+    newRdfModel.absoluteAspectModelFileName = `${emptyNamespace}${fileName}`;
     this.rdfService.currentRdfModel = newRdfModel;
     if (oldFile) {
       this.namespaceCacheService.removeFile(oldFile.namespace, oldFile.fileName);