Description of problem:
If you create or clone a repo under a name that is already used, nothing really happens but you get a success message.


Version-Release number of selected component (if applicable):
BPMS 6.0 ER3


Steps to Reproduce:
1. Create / clone a repository, fill in name 'NAME'.
2. Make a change - e.g. add a file.
3. Create or clone another repository, but again fill in name 'NAME'.


Actual results:
'The repository is created/cloned successfully' alert. The repo contents are the same - new file is still there.


Expected results:
An alert that the user cannot create or clone an already existing repository or some request for confirmation, that the existing repo should be overwritten (and actually overwriting it then).