feat(docs): Add troubleshooting section for empty_file error

[filterpaper]

Add a troubleshooting section for empty_file.c lacks #binding-cells error

[filterpaper]

Thanks for the feedback. Suggestions are committed.

[huber-th]

Looking at this again, I wonder if this devicetree_unfixed.h is also a devicetree error which should be added to the above section rather than having its own header?

The example looks like the start devicetree error: was removed. Otherwise it looks like a similar error in which case it probably shouldn't have it's own heading?

[caksoylar]

Here is a recent variant of this error: https://github.com/l2yuk3n/zmk-config/actions/runs/8303562600/job/22727892620#step:11:120 It indeed doesn't start with devicetree error:.

I believe the wording is a bit different since the last Zephyr upgrade or two, so it would be good to update it. For instance unfixed is now generated. I think it would make sense to merge this with this new section as well, since the root cause is very similar (or the same? mismatch between the binding and #parameters).

That being said we can do that in another PR.

[caksoylar]

Thanks again, I can merge this unless you decide you would like to address the new comment (it's fine to not do it right now, like I noted).

[filterpaper]

Thanks again, I can merge this unless you decide you would like to address the new comment (it's fine to not do it right now, like I noted).

Lets merge this particular PR if you are fine with the empty_file error. The current "devicetree_generated.h" message is a different context.

[caksoylar]

Thanks!