Fix the case where no color matrix but X;Y are vectors

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (b3b2f2c) 90.34% compared to head (8d2ca31) 90.34%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1347 +/- ## ======================================= Coverage 90.34% 90.34% ======================================= Files 133 133 Lines 16695 16696 +1 ======================================= + Hits 15083 15084 +1 Misses 1612 1612 ```

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