Unable to backport pulls with empty description (i.e. body)

[mjlbach]

Hi!

I'm currently unable to get the 0.6 release working with the backport action.

You can see the example repo here:
https://github.com/mjlbach/backport-test

For backporting the following PR:
https://github.com/mjlbach/backport-test/pull/4

with the aforementioned failure in the actions log
https://github.com/mjlbach/backport-test/runs/3946924742?check_suite_focus=true#step:3:29

[mjlbach]

I think the issue is if the body (text) of the PR is empty. I'm guessing here: https://github.com/zeebe-io/backport-action/blob/3d81647b2ded9f404d573760c567b2fe4b324d2c/dist/index.js#L645

[korthout]

Hi @mjlbach, thanks for pointing this out! That's clearly a bug.

I think the issue is if the body (text) of the PR is empty.

Yeah, definitely looks like that this is the problem and the action should support pull requests with empty bodies.

I'm guessing here:

Yes, but only at runtime. The source code for that line is located here:
https://github.com/zeebe-io/backport-action/blob/3d81647b2ded9f404d573760c567b2fe4b324d2c/src/utils.ts#L34

Feel free to open a pull request to resolve this, if you happen to have time for it.

[korthout]

I'll edit the issue title to reflect the root cause.

The symptom is: Fails during PR creation with Cannot read property 'match' of null