catching error during messy RGBA colour handling #221
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When using matplotlib colours like "darkorange" or "darkred"
https://github.com/nschloe/matplotlib2tikz/blob/66da89dcd5c6b3eff14602ae28e14bc10075ff00/matplotlib2tikz/legend.py#L206
creates nested RGBA codes like
and matplotlib will throw an error.
With this PR, the error gets caught and the function call repeated with a
numpy.squeezeapplied to the colour.