Update modules/openapi-generator/src/main/resources/typescript-rxjs/runtime.mustache

Co-Authored-By: denyo <[email protected]>

Author: macjohnny

modules/openapi-generator/src/main/resources/typescript-rxjs/runtime.mustache

@@ -1,6 +1,6 @@
 // tslint:disable
 {{>licenseInfo}}
-import { Observable, of } from 'rxjs';
+import { Observable, of, throwError } from 'rxjs';
 import { ajax, AjaxResponse } from 'rxjs/ajax';
 import { map, concatMap } from 'rxjs/operators';