More consistent legacy color conversion #37
Merged
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When a given "legacy color" argument is not in fact a recognised color
name,
legacy_color
should return nil, and indeed it does when theargument is a string.
However, the color symbol method will just return the symbol argument if
it is not recognised, creating an inconsistency in the behaviour.
Instead, it should return nothing, as the string case does.
This change is made, and a little of the surrounding code rearranged for
clarity.