Git does not report an error when creating a managed repository over an existing one

Steps to reproduce:

• open the folder containing the repositories managed by FishEye (by default FISHEYE_INST/managed-repos)
• create a new empty Git repository and commit something to it:

  git init test.git
  echo test > test
  git add test
  git commit -m"test"
  

• in the FishEye Admin, create a managed Git repository with the name 'test'

--> No error is reported, and if you clone the repo locally, you can see it is not an empty Git repository (git log returns the commit generated above)

This can happen for example if an existing managed repo was removed from config.xml (the repo is not registered to FishEye but still exists on disk)