* fix: show client-side error if wiki page is empty
Implement a JS, client-side validation workaround for a bug in the upstream
editor library SimpleMDE which breaks HTML5 client-side validation when
a wiki page is submitted.
This allows native, client-side errors to appear if
the text editor contents are empty.
See upstream bugfix report: https://github.com/sparksuite/simplemde-markdown-editor/issues/324
Signed-off-by: David Jimenez <dvejmz@sgfault.com>
Co-authored-by: Lauris BH <lauris@nix.lv>
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