* 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 <[email protected]> Co-authored-by: Lauris BH <[email protected]>