Extension crashes whenever it can't reach the git server

[rrvsh]

Subject of the issue

Whenever the client is unable to reach the git server for whatever reason, the extension simply crashes as the resultant exception is uncaught.

Steps to reproduce

1. Add a remote that can't be accessed
2. Reload the window so the extension reactivates
3. See the error in the Features tab of the extension

Expected behaviour

A message box should pop up telling the user the error received, then try again after a delay.

Actual behaviour

Extension just crashes until the window is reloaded.

[rrvsh]

It is my fault because I was too lazy to implement any error handling. Will fix in next release