fix type for responseType for xhr

Author: bertramr

src/templates/core/xhr/sendRequest.hbs

@@ -10,7 +10,7 @@ export const sendRequest = async (
 	const xhr = new XMLHttpRequest();
 	xhr.open(options.method, url, true);
 	xhr.withCredentials = config.WITH_CREDENTIALS;
-	xhr.responseType = options.responseType;
+	xhr.responseType = options.responseType ?? "";
 
 	headers.forEach((value, key) => {
 		xhr.setRequestHeader(key, value);