[Sqlalchemy-commits] commit/sqlalchemy: zzzeek: Protect against cls weakref becoming None

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1 new commit in sqlalchemy:

https://bitbucket.org/zzzeek/sqlalchemy/commits/e3035661f4d3/
Changeset:   e3035661f4d3
Branch:      rel_1_1
User:        zzzeek
Date:        2017-05-08 22:37:40+00:00
Summary:     Protect against cls weakref becoming None

Protected against testing "None" as a class in the case where
declarative classes are being garbage collected and new
automap prepare() operations are taking place concurrently, very
infrequently hitting a weakref that has not been fully acted upon
after gc.

Change-Id: I32e1dfc5ac46bac4127fe808cfd18368e2fad9dd
(cherry picked from commit 22570c3181ef4e98c548c2f6254a0c7585568f06)

Affected #:  3 files

Repository URL: https://bitbucket.org/zzzeek/sqlalchemy/

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