Regression: `NvimWebDeviconsHiTest` crashes

[simeonoff]

I believe after merging this PR the panel now crashes with:

I have the font-symbols-only-nerd-font cask installed via brew(macOS) which is at version 3.1.1 of the nerd font symbols and they don't include the prettier icon.

[simeonoff]

My bad, it was down to the way I have overwritten the config for some icons. 🫣

[alex-courtis]

This should be hardened / fixed. The failed icon can be shown as an error.

[alex-courtis]

Fix incoming: #423

@simeonoff I'd be most grateful if you could test this one with your original case:

cd /path/to/nvim-web-devicons
git pull
git checkout 419-hi-test-fail-on-bad-icon

When you're finished testing:

git checkout master

[simeonoff]

@simeonoff I'd be most grateful if you could test this one with your original case:

Will do!

[simeonoff]

Ok, tested it, works like a charm! No more errors being thrown.

Edit: Also nice to see a list of which icons have been overridden.