Update generic/install-tmux-catppuccin-theme

add error checking

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: mapitman

generic/install-tmux-catppuccin-theme

@@ -2,8 +2,12 @@
 # source <(curl -fsSL https://raw.githubusercontent.com/mapitman/linux-bootstrap/main/generic/install-tmux-catppuccin-theme)
 
 mkdir -p ~/.config/tmux/plugins/catppuccin
-git clone -b v2.1.3 https://github.com/catppuccin/tmux.git ~/.config/tmux/plugins/catppuccin/tmux
-
-echo "Catppuccin theme for tmux has been installed."
-echo "To apply the theme, add the following line to your .tmux.conf file:"
-echo "run ~/.config/tmux/plugins/catppuccin/tmux/catppuccin.tmux"
+if git clone -b v2.1.3 https://github.com/catppuccin/tmux.git ~/.config/tmux/plugins/catppuccin/tmux; then
+  echo "Catppuccin theme for tmux has been installed."
+  echo "To apply the theme, add the following line to your .tmux.conf file:"
+  echo "run ~/.config/tmux/plugins/catppuccin/tmux/catppuccin.tmux"
+else
+  echo "Error: Failed to clone Catppuccin tmux theme repository." >&2
+  # If sourced, return non-zero; if executed directly, exit non-zero.
+  return 1 2>/dev/null || exit 1
+fi