Prevent tmux color change if it's not running

bin/bin/toggle-color-mode

@@ -21,10 +21,12 @@ cat $alacritty/alacritty-base.yml $alacritty/themes/$new_color.yml >> $alacritty
 
 echo $new_color > $color_file
 
-for pane_info in $(tmux list-panes -a -F '#{pane_id}-#{pane_current_command}'); do
+if tmux info &> /dev/null; then
+  for pane_info in $(tmux list-panes -a -F '#{pane_id}-#{pane_current_command}'); do
     IFS=- read pane cmd <<< "$pane_info"
 
     if [[ $cmd == "vim" || $cmd == "nvim" ]]; then
       tmux send-keys -t $pane ":lua ChangeBackground()" ENTER
     fi
-done
+  done
+fi