Refactor Catalyst.php error handling

  • Catalyst.php: Throws an exception if an error occurs and handles in caller.
  • Doesn't display wikis in the wiki table if they aren't returned by catalyst.
  • Displays a warning before the previously generated wikis table if catalyst could not be reached.
  • Index.php: Moves all catalyst wiki operations into one block instead of two.

Bug: T422752 Bug: T416391

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