Throw / catch specific exception in db.close()

[vikramrajkumar]

From @theoreticalbts on September 8, 2015 20:29

The db_close() function has a catch-all-do-nothing block. It should re-throw (or at least log) any unexpected exception.

Copied from original issue: cryptonomex/graphene#301

[oxarbitrage]

#246

pull request add log to the block. i was not able to trigger an exception there to really see if it is working but with the new pull request i compiled the node, i synchronized and went into it with a web wallet. all good.