history: make sure db corruptions can cause startup failures
http://bugs.activestate.com/show_bug.cgi?id=101551
r=marky
rn=

(integrated from komodo (trunk) change 83087 by ericp)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@14001 b87d16e7-d29f-4ee1-b5ec-817d645d335f