Improved creation of JGitInternalException

There where 3 cases where a JGitInternalExcption was created
without specifying the root cause. This has been fixed.

Change-Id: I2ee08d04732371cd9e30874b1437b61217770b6a
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
2 files changed