The icon picker grid starts with an empty string entry that renders the
"no icon" (prohibit) symbol, but the onClick guard "if (icon)" treated
the empty string as falsy and ignored the click. Change the guard to
check for a defined string value so the empty/no-icon option can be
selected.
Closes#3252Closes#3261
Co-authored-by: Devin <devin@example.com>
Co-authored-by: Amruth Pillai <im.amruth@gmail.com>
