Arch Linux

Description:
As can be seen from https://github.com/pazz/urwidtrees/blob/master/setup.py , version 1.0.3 of the package requires an additional dependency ("python-mock"), which makes programs that rely on it throw this exception:

pkg_resources.DistributionNotFound: The 'mock' distribution was not found and is required by urwidtrees

As this is only needed to build the docs on very old Python versions that don't come with the unittest module, the dependency could be either patched out or added to the list of dependencies.

Additional info:
* package version(s): 1.0.3

Steps to reproduce:
pacman -S alot
alot