#5601 Fix empty API response handling (#5602)

* #5601 Improve handling of empty api response

* improve fix

Author: sosnovsky

extension/js/common/api/shared/api.ts

@@ -237,12 +237,21 @@ export class Api {
           return { response, pipe: Value.noop }; // original response
         }
       };
+
       if (resFmt === 'text') {
         const transformed = transformResponseWithProgressAndTimeout();
         return (await Promise.all([transformed.response.text(), transformed.pipe()]))[0] as FetchResult<T, RT>;
       } else if (resFmt === 'json') {
-        const transformed = transformResponseWithProgressAndTimeout();
-        return (await Promise.all([transformed.response.json(), transformed.pipe()]))[0] as FetchResult<T, RT>;
+        try {
+          const transformed = transformResponseWithProgressAndTimeout();
+          return (await Promise.all([transformed.response.json(), transformed.pipe()]))[0] as FetchResult<T, RT>;
+        } catch (e) {
+          // handle empty response https://github.com/FlowCrypt/flowcrypt-browser/issues/5601
+          if (e instanceof SyntaxError && e.message === 'Unexpected end of JSON input') {
+            return undefined as FetchResult<T, RT>;
+          }
+          throw e;
+        }
       } else {
         return undefined as FetchResult<T, RT>;
       }