fix(coloring): invalid color application for rows with VALID column #3137
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During usage of k9s we saw one specific CRD of ours always show up in an error color despite it being fully ready an healthy

After some investigation I found, that the error color is applied by the default
ColoringFunc
in case the resource is deemed not valid. After finding the code for this, I figured that the logic in case a "VALID" column seems to be incorrect, as it deems the resource invalid if its something else than an empty string.I tried fixing it in this PR and also added some tests to this previously untested helper function
With the adjusted logic, the rendering seems to be correct!