config/functions: allow null invocatin of print_color

Signed-off-by: Ian Leonard <antonlacon@gmail.com>

config/functions

@@ -38,6 +38,8 @@ listremoveitem() {
 print_color() {
   local clr_name="$1" clr_text="$2" clr_actual
 
+  [ -z "${clr_name}" ] && return 0
+
   if [ "$DISABLE_COLORS" = "yes" ]; then
     [ $# -eq 2 ] && echo -en "${clr_text}"
     return 0