CSCwj84515: only download file when response returns zip file - and f…

…ixed file name

src/components/Operation/Operation.tsx

@@ -163,21 +163,24 @@ export class Operation extends React.Component<OperationProps, OperationState> {
     setCookieParams(cookieParams);
 
     this.setState({ pendingRequest: true });
-    fetch(`${appendParamsToPath(path, pathParams, queryParams)}`, request)
+    const api_url = `${appendParamsToPath(path, pathParams, queryParams)}`
+    fetch(api_url, request)
       .then(async (response: any) => {
         const statusCode = response.status;
         const statusType = mapStatusCodeToType(statusCode);
         const isError = statusType === 'error';
         const contentType = response.headers.get('content-type');
 
-        if (contentType?.indexOf('application/zip') !== -1 && !isError) {
-          const slug = last(path?.split('/') || []);
+        if (contentType && contentType?.indexOf('application/zip') !== -1 && !isError) {
+          const slug = last(api_url?.split('/') || []);
           const fileName = slug || 'file';
           const bytes = await response.blob();
+
           const temporaryAnchor = document.createElement('a');
           temporaryAnchor.href = URL.createObjectURL(bytes);
           temporaryAnchor.setAttribute('download', fileName);
           temporaryAnchor.click();
+
           this.setState({
             response: {
               type: mapStatusCodeToType(statusCode),