Exception logging mis-formatting error

[Allan LeSage]

Small problem encountered when an exception is being raised when a bug isn't found, this happened during a Launchpad outage.

2012-11-29 19:16:48,582 - DEBUG - Creating report for CID 10645
2012-11-29 19:16:48,583 - WARNING - Warning: no severity provided for checker PARSE_ERROR
2012-11-29 19:16:49,041 - DEBUG - Updating
2012-11-29 19:17:31,471 - ERROR - Failed to export defect 10645 to Launchpad: Traceback (most recent call last):
  File "/home/ubuntu/coverity-launchpad-sync-tool/covlpsync/covlpsync.py", line 177, in sync_cid
    self.update_lp_bug(defect_report, lp_bug_id)
  File "/home/ubuntu/coverity-launchpad-sync-tool/covlpsync/covlpsync.py", line 129, in update_lp_bug
    self.lp.update_defect(defect_report, lp_bug_id)
  File "/home/ubuntu/coverity-launchpad-sync-tool/covlpsync/launchpad.py", line 21, in wrapper
    return func(*args, **kwargs)
  File "/home/ubuntu/coverity-launchpad-sync-tool/covlpsync/launchpad.py", line 141, in update_defect
    lp_bug = self.get_bug(lp_bug_id)
  File "/home/ubuntu/coverity-launchpad-sync-tool/covlpsync/launchpad.py", line 21, in wrapper
    return func(*args, **kwargs)
  File "/home/ubuntu/coverity-launchpad-sync-tool/covlpsync/launchpad.py", line 66, in get_bug
    raise LaunchpadException("Bug not in Launchpad: %d" % lp_bug_id)
TypeError: %d format: a number is required, not Text