message: Add a warning if char does not correspond to a validity check
diff: @@ -1432,6 +1432,11 @@ namespace RINGMesh
  {
  remove_check(check_mode, validity_checks_to_chars[check]);
  }
  + else
  + {
  + Logger::warn( "Validity", "'", check, "' does not match to any ",
  + "validity check. " );
  + }
  }
  return check_mode;
  }
  