Correctly ignore empty 'commands' parameter
Correctly ignore empty 'commands' parameter

A logic bug had us passing a list with an empty string instead of none,
resulting in us trying to find a command that didn't exist.

Signed-off-by: Stephen Finucane <06fa905d7f2aaced6dc72e9511c71a2a51e8aead@that.guru>
Closes: #99

click-contrib/sphinx-click