"Loader commit was called but there is no staged data" warning is logged for loader known errors

[romansp]

I followed the steps in the docs on Error Handling and added error: [KnownError] to my basic loader. When KnownError is thrown from data loader it's correctly captured and set as the error of data loader result.

But I also noticed that the following warning is being logged each time known error is thrown. Warning is only logged in development.

Loader "undefined"'s "commit()" was called but there is no staged data.

commit	@	basic.js:87
(anonymous)	@	index.js:95
(anonymous)	@	vue-router.mjs:3475
runWithContext	@	runtime-core.esm-bundler.js:4024
runWithContext	@	vue-router.mjs:3387
(anonymous)	@	vue-router.mjs:3475
triggerAfterEach	@	vue-router.mjs:3475
(anonymous)	@	vue-router.mjs:3370
Promise.then		
pushWithRedirect	@	vue-router.mjs:3335
push	@	vue-router.mjs:3260
navigate	@	vue-router.mjs:2315
callWithErrorHandling	@	runtime-core.esm-bundler.js:199
callWithAsyncErrorHandling	@	runtime-core.esm-bundler.js:206
invoker	@	runtime-dom.esm-bundler.js:730

Everything seems to be working well but wasn't sure if this warning is relevant or can be safely ignored?

Minimal repro: https://github.com/romansp/uvr-data-loader-known-errors

Repro steps

1. Clone the repo.
2. pnpm install
3. pnpm run dev
4. Go to the app.
5. Open browser console.
6. Click the links below to trigger navigation and load data.

Expected
Clicking "Load data with known error" should display KnownError on the page. No warning in the console.

Actual
Clicking "Load data with known error" logs a warning in the console.

[romansp]

Would like to contribute with a PR if that's okay.

Do I understand correctly warning should not be displayed because at that point stagedError is already set and warning can be skipped?

Also the message itself Loader "undefined"'s "commit()" looks a bit weird as loader doesn't have an explicit key here. Wonder if this can be improved here as well.

[posva]

Thanks! It should be an easy contribution: the warn should not appear if there is a staged error.