deal with errors that aren't error responses

src/app/core/dspace-rest/dspace-rest.service.ts

@@ -112,11 +112,15 @@ export class DspaceRestService {
         statusText: res.statusText
       })),
       catchError((err) => {
+        if (hasValue(err.status)) {
           return observableThrowError({
             statusCode: err.status,
             statusText: err.statusText,
             message: (hasValue(err.error) && isNotEmpty(err.error.message)) ? err.error.message : err.message
           });
+        } else {
+          return observableThrowError(err);
+        }
       }));
   }