handle an empty colormap element for substrate in svg #393
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a user recently had this issue where the
<colormap>element was empty but the substrate plotting was enabled. This throws a warning when the parsed colormap string is too short (empty or just a single character) and defaults to theYlOrRdcolormap that is the default.It's worth noting that defaulting to
YlOrRdalready occurs if the colormap string is not recognized. The issue with empty or 1-character colormaps is the check for a_rsuffix required checking two characters from the end. So, in short, this makes sure these pathological colormap strings also fall back to the same default.