[FIX] Wiki parser: fixed Undefined array key searchable_by_default php80
Relates: https://app.glitchtip.com/evoludata/issues/2045531
Only some plugins have searchable_by_default key in their info function.
Relates: https://app.glitchtip.com/evoludata/issues/2045531
Only some plugins have searchable_by_default key in their info function.