Handle error thrown in postConfigUpdateToAPI (#3299)

Co-authored-by: Tiffany L <tleugn@wpi.edu>

web/utils/config-constants.tsx

@@ -54,6 +54,7 @@ const TEXTFIELD_TYPE_URL = 'url';
 
 export async function postConfigUpdateToAPI(args: ApiPostArgs) {
   const { apiPath, data, onSuccess, onError } = args;
+  try {
     const result = await fetchData(`${SERVER_CONFIG_UPDATE_URL}${apiPath}`, {
       data,
       method: 'POST',
@@ -65,6 +66,12 @@ export async function postConfigUpdateToAPI(args: ApiPostArgs) {
       onError(result.message);
     }
   }
+  catch (e) {
+    if (onError) {
+      onError(e.message);
+    }
+  }
+}
 
 // Some default props to help build out a TextField
 export const TEXTFIELD_PROPS_SERVER_NAME = {