Detect and highlight/hide empty/non-existing pages

Most wiki software has features to distinguish links to non-existing pages from links to existing pages (e.g. MediaWiki shows the former in red). logseq automatically creates an empty page once you link it, but it is not saved to file. In the user interface there is no way to distinguish normal pages from non-existing pages. logseq should

  • add a special CSS class at links to empty pages and style them different to normal page links
  • provide a switch to hide empty pages from the graph and from the list of pages