fix: don't show docker version when daemon is not running

[simoarpe]

Description

Detect when Docker daemon is not running and in such a case do not show the version number

Motivation and Context

Closes #221

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How Has This Been Tested?

• I have tested using MacOS
• I have tested using Linux

Checklist:

• I have checked that no other PR duplicates mine
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have updated the tests accordingly.