[GRASS-dev] Report assigned color table for a map

[Nikos Alexandris]

How do we know a map has already a color table assigned?
Wouldn't this be "important" to have it reported by `r.info`, for example?

Also, `r.colors` does "-w Only write new color table if it does not
already exist". But how do we report an "existing" color table (of
course, except of manually checking if a map's name file exists in
colr)?

By the way, maybe this one message can be changed to:
"-w  Create only if the map has no color table assigned"

Nikos
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