[PR #8514/df7fe19b backport][stable-8] pacman: do not fail if there is nothing to do (#8522)

pacman: do not fail if there is nothing to do (#8514)

Do not fail if there is nothing to do.

(cherry picked from commit df7fe19bbe)

Co-authored-by: Felix Fontein <felix@fontein.de>

changelogs/fragments/8514-pacman-empty.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - "paman - do not fail if an empty list of packages has been provided and there is nothing to do (https://github.com/ansible-collections/community.general/pull/8514)."

plugins/modules/pacman.py

@@ -367,8 +367,9 @@ class Pacman(object):
                 self.install_packages(pkgs)
                 self.success()
 
-        # This shouldn't happen...
-        self.fail("This is a bug")
+        # This happens if an empty list has been provided for name
+        self.add_exit_infos(msg='Nothing to do')
+        self.success()
 
     def install_packages(self, pkgs):
         pkgs_to_install = []