code: public boolean containsResourceBundleOfID (@Nullable final String sBundleID)
    {
      if (StringHelper.hasNoText (sBundleID))
        return false;
  
      return m_aRWLock.readLocked ( () -> m_aMapToBundle.containsKey (sBundleID));
    }
docs: Check if the passed resource bundle ID is contained.
  
  @param sBundleID
  The bundle ID to be checked. May be <code>null</code>.
  @return <code>true</code> if the passed bundle exists, <code>false</code>
  otherwise.