<!--- Verify first that your issue is not already reported on GitHub -->
<!--- Also test if the latest release and devel branch are affected too -->
<!--- Complete *all* sections as described, this form is processed automatically -->

##### SUMMARY
<!--- Explain the problem briefly below -->
Pacman module throws "get_name: fail to retrieve package name from pacman output" for packages that have been already installed. This error completely prevents execution of playbooks.

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
<!--- Write the short name of the module, plugin, task or feature below, use your best guess if unsure -->
Pacman

##### ANSIBLE VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
```paste below
ansible 2.9.0
  config file = /etc/ansible/ansible.cfg
  configured module search path = ['/home/tomek/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python3.7/site-packages/ansible
  executable location = /usr/bin/ansible
  python version = 3.7.4 (default, Oct  4 2019, 06:57:26) [GCC 9.2.0]
```

##### CONFIGURATION
<!--- Paste verbatim output from "ansible-config dump --only-changed" between quotes -->
```paste below

```

##### OS / ENVIRONMENT
<!--- Provide all relevant information below, e.g. target OS versions, network device firmware, etc. -->
Arch Linux

##### STEPS TO REPRODUCE
<!--- Describe exactly how to reproduce the problem, using a minimal test-case -->
Execute any playbook on the Arch Linux OS with using Pacman module for package that has been installed previously.

<!--- Paste example playbooks or commands between quotes below -->
```yaml

```

<!--- HINT: You can paste gist.github.com links for larger files -->

##### EXPECTED RESULTS
<!--- Describe what you expected to happen when running the steps above -->
Pacman module shouldn't throw an error and break execution of playbook.

##### ACTUAL RESULTS
<!--- Describe what actually happened. If possible run with extra verbosity (-vvvv) -->
Pacman module throws an error and breaks execution of playbook.

<!--- Paste verbatim command output between quotes -->
```paste below

```

from __future__ import absolute_import, division, print_function
__metaclass__ = type
ANSIBLE_METADATA = {'metadata_version': '1.1',
                    'status': ['preview'],
                    'supported_by': 'community'}
DOCUMENTATION = '''
---
module: pacman
short_description: Manage packages with I(pacman)
description:
    - Manage packages with the I(pacman) package manager, which is used by Arch Linux and its variants.
version_added: "1.0"
author:
    - Indrajit Raychaudhuri (@indrajitr)
    - Aaron Bull Schaefer (@elasticdog) <aaron@elasticdog.com>
    - Maxime de Roucy (@tchernomax)
options:
    name:
        description:
            - Name or list of names of the package(s) or file(s) to install, upgrade, or remove.
              Can't be used in combination with C(upgrade).
        aliases: [ package, pkg ]