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Prevent RColorBrewer::brewer.pal warning #1999

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Prevent RColorBrewer::brewer.pal warning #1999

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Commits on Sep 14, 2021

  1. Prevent RColorBrewer::brewer.pal warning 

    `RColorBrewer::brewer.pal()` throws an (in this case) unnecessary warning if the output plot requires less than 2 colors. This is an easy fix, and does not change the workings of the code since `RColorBrewer::brewer.pal()` never returns less than three levels anywas:

```
> RColorBrewer::brewer.pal(2, "Set2")
[1] "#66C2A5" "#FC8D62" "#8DA0CB"
Warning message:
In RColorBrewer::brewer.pal(2, "Set2") :
  minimal value for n is 3, returning requested palette with 3 different levels
```
    @s-fleck
    s-fleck committed Sep 14, 2021
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