code: @Nonnull
    public static String getImplodedNonEmpty (@Nullable final Iterable <String> aElements)
    {
      return getImplodedMappedNonEmpty (aElements, Function.identity ());
    }
docs: Get a concatenated String from all non-<code>null</code> and non empty
  elements of the passed container without a separator string. This the very
  generic version of {@link #getConcatenatedOnDemand(String, String)} for an
  arbitrary number of elements.
  
  @param aElements
  The container to convert. May be <code>null</code> or empty.
  @return The concatenated string.