docs: public void setIgnoredPackagings (final Set <String> aCollection)
    {
      ignoredPackagings = new HashSet <> ();
      if (aCollection != null)
      {
        for (final String sName : aCollection)
          if (StringHelper.hasText (sName))
            if (!ignoredPackagings.add (sName))
              getLog ().warn ("The ignored packaging '" + sName + "' is contained more than once");
      }
    }