Fix crash when sending OSC 4 (RGB) color outside 256 range
requested to merge luisbocanegra/konsole:work/luisbocanegra/fix-osc-4-out-of-color-table into master
Tested by running the following commands
echo '\e]4;-1;#ff0000\e]'
echo '\e]4;257;#ff0000\e]'Edited by Luis Bocanegra