Fix axis facets

[trekonom]

This PR fixes a bug in verify_attr which closes #1720 and #1577 .

Adding the fix the reprex from #1720 is rendered like so

and the reprex from #1577 like so:

[cpsievert]

Looks great, thank you! If you agree with the suggested change, please commit it and add a news item, then I'll merge

BTW, have you tried to create and/or run visual tests? I think we can get away with not having one here, but it'd be great to have them in some of your other PRs

[trekonom]

Just commited your changes and added a news item.

Regarding the visual tests:

• Visual tests and svgs are already present for PRs Geom errorbar issure 1751 #1779 and Add support for ggalt::geom_dumbbell. #1782 .
• However the visual tests always failed while vdiffr::manage_cases showed successful doppelganger.
• Therefore I decided to comment them out in my commits.

I also tried running the visual tests via docker ...

• Following your instructions , i.e. running docker run -v $(pwd):/home/plotly --privileged -p 3838:3838 cpsievert/plotly-orca always resulted in the error invalid reference format.
• But as I used docker for the first time maybe I simply got something wrong.

[cpsievert]

Hmm, are you in windows powershell? https://stackoverflow.com/a/51379726/1583084

[trekonom]

(: Thanks a lot. It was the Powershell issue. Now the docker works like a charm. BTW: I also figured out my issue with visual testing inside RStudio. After running the tests via devtools::test() (as you suggested in the contributing guidelines) instead of pressing the "Run Tests" button my visual tests passed.

[cpsievert]

Ahh, yea, sorry, I should've mentioned before that the visual tests should only really only be run via docker