#53 image generation breaks when legend label is too length

[MoMaT]

If the following legend property is set:
legendProperties.setNumColumns(LegendAreaProperties.COLUMNS_FIT_TO_IMAGE)
and the legend label and its font size is set to such
values, that the label is wider than the chart width,
the generation of a chart breaks. Only the top part of
it is rendered.

The expected behaviour would be to scale the chart
concerning the length of its legend's labels.