Description of problem:

When you add another repo in Business Central and then delete repository1 repository and added repository - a window with "Unable to complete your request. The following exception occurred: null." is shown. However, it is not shown always.

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

6.1.0.ER4-deployable-eap6.x deployed on EAP 6.3.0, OpenJDK 1.7, Mozilla Firefox.

How reproducible:

The best way for me to reproduce was fresh installation (overwriting folders in EAP, since I used deployable-eap6.x version)

Steps to Reproduce:
0) Do not delete repository1 repo
1) Go to 'authoring' -> 'administration'
2) Choose 'repositories' -> 'clone repository'
3) Enter:
repository name: bpms-assets
organizational unit: example
git url: git://git.app.eng.bos.redhat.com/bpms-assets.git
and hit 'clone'.
4) Go to Authoring -> Project Authoring then back to Authoring -> Administration.
5) Delete repository1 repo and then bpms-assets repo - in this order.
6) Error in server log should be logged. It says Index fails etc. A file with stacktrace is attached. A window with "Unable to complete your request. The following exception occurred: null." should be shown. However, it is not shown always. Sometimes you have to navigate to Home Page, log in/log out, or restart server to see this window. Mostly restarting server is the best way to show this window.

Please see screenshot with error window and file with stacktrace from server log, I hope it will help.