WIP: More verbose message for missing configs on update-queries

[Simaris]

Fix #226

• Fix
• Tests
  • Isolate Test with docker or similar technology

[coveralls]

Coverage decreased (-0.3%) to 74.588% when pulling 42be2d0 on Simaris:feature/verbose_message into 79293ca on AKSW:master.

[coveralls]

Coverage decreased (-0.1%) to 74.865% when pulling 80d1db2 on Simaris:feature/verbose_message into 1a81c33 on AKSW:master.

[white-gecko]

When the user.name is set I get the message:

Unable to process query: git config value 'user.name' was not found.
Pls use the following command in your data repo:

  git config user.email <your email>

Especially git config value 'user.name' was not found. is wrong.

Also please be more verbose and don't just write Pls.

[white-gecko]

This causes problems, maybe because of the new pygit2 version.