CORE-1219. Removed empty DatabaseException catch blocks around database.rollback() calls in the LockService, which were believed to hide the real cause of the problem described in the incident. Initially, it was thought that no databse.rollback() was being called, thus leaving the Oracle lock hanging. However, the code inspection revealed that database.rollback() must have been called (as it was alreay in the finally block); however, it must have failed for some reason, and this reason was not reported due to empty DatabaseException catch blocks.
Merge pull request #80 from dtserekhman/2_0_x

CORE-1219. Removed empty DatabaseException catch blocks in LockService