no ramp legend for continuous scales with a degenerate domain #2211
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closes #2210
I considered an alternative where we would generate a ramp “from x to x” if there is 1 element, and “from NaN to NaN” if there is none. This would show the interpolator colors (like below).
However the bug report shows that we might be in a case where we normally expect an ordinal scale, but since the empty domain makes it impossible to automatically determine if we're ordinal or linear, the ramp is just a consequence of having defaulted to linear.