Fix pacman: "IndexError: list index out of range" #63077 (#65750) (#67011)

* Fix #63077

If the package is already installed the stdout is not as expected by this function. Either remove `--needed` or just noop if we detect pacman returning. We cannot match the stdout string, as that is most likely localized.

```
[root@archBook user]# /usr/bin/pacman --upgrade --noconfirm --noprogressbar --needed  /srv/aur/src/i3cat-git/i3cat-git-r38.c6d29dd-1-x86_64.pkg.tar.xz
loading packages...
warning: i3cat-git-r38.c6d29dd-1 is up to date -- skipping
 there is nothing to do
```

* Add comment

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* Add changelog fragment.

Co-authored-by: Felix Fontein <felix@fontein.de>
(cherry picked from commit 14b1febf64)

Co-authored-by: Klaus Frank <agowa338@users.noreply.github.com>

changelogs/fragments/65750-pacman.yml

@@ -0,0 +1,2 @@
+bugfixes:
+- "pacman - fix module crash with ``IndexError: list index out of range`` (https://github.com/ansible/ansible/issues/63077)"

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

@@ -338,6 +338,9 @@ def install_packages(module, pacman_path, state, packages, package_files):
         if rc != 0:
             module.fail_json(msg="failed to install %s: %s" % (" ".join(to_install_repos), stderr))
 
+        # As we pass `--needed` to pacman returns a single line of ` there is nothing to do` if no change is performed.
+        # The check for > 3 is here because we pick the 4th line in normal operation.
+        if len(stdout.split('\n')) > 3:
             data = stdout.split('\n')[3].split(' ')[2:]
             data = [i for i in data if i != '']
             for i, pkg in enumerate(data):
@@ -354,6 +357,9 @@ def install_packages(module, pacman_path, state, packages, package_files):
         if rc != 0:
             module.fail_json(msg="failed to install %s: %s" % (" ".join(to_install_files), stderr))
 
+        # As we pass `--needed` to pacman returns a single line of ` there is nothing to do` if no change is performed.
+        # The check for > 3 is here because we pick the 4th line in normal operation.
+        if len(stdout.split('\n')) > 3:
             data = stdout.split('\n')[3].split(' ')[2:]
             data = [i for i in data if i != '']
             for i, pkg in enumerate(data):