cat-highlight: Allow unset variables

.config/zsh/functions/cat-highlight

@@ -7,7 +7,7 @@
 # export CATOPEN="highlight --force --out-format=truecolor --stdout %s"
 # alias cat='cat-highlight'
 
-setopt LOCAL_OPTIONS ERR_RETURN NO_UNSET PIPE_FAIL
+setopt LOCAL_OPTIONS ERR_RETURN PIPE_FAIL
 
 # Check if we are in a terminal and a highlighter is defined
 if [[ -t 1 ]] && [[ -n "${CATOPEN}" || -n "${LESSOPEN}" ]]; then