[ZODB-Dev] Attempt to release connection when storage is None

[Sean Upton]

I am seeing something curious on a new Zope2 deployment (2.13.21, Plone
4.3) where ZODB attempts to release a storage on Control+C shutdown of a
foregrounded zope2 instance, but a connection has a _storage attribute
equal to None, thus this traceback:

  http://pastie.org/8275219

This is Zope 2.13.21, ZODB 3.10.5, transaction 1.1.1, RelStorage 1.5.1 on
Python 2.7 (my build) on Ubuntu 10.04 AMD64.

I am thinking this might be related to this Zope2 commit:

https://github.com/zopefoundation/Zope/commit/5032027470091957a6c0028da04c0fc0a1ed646b

This seems benign, but I wanted to verify?

Sean
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