pacman: Check for package list before installing (#52246)

Fixes: #45638

Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>

lib/ansible/modules/packaging/os/pacman.py

@@ -474,6 +474,8 @@ def main():
             install_packages(module, pacman_path, p['state'], pkgs, pkg_files)
         elif p['state'] == 'absent':
             remove_packages(module, pacman_path, pkgs)
+    else:
+        module.exit_json(changed=False, msg="No package specified to work on.")
 
 
 if __name__ == "__main__":