0.12.6dev: prevent //'Pool' object has no attribute '_pool'// caused by race-conditions during creating application-level pool (fixed #11411)
0.12.6dev: prevent //'Pool' object has no attribute '_pool'// caused by race-conditions during creating application-level pool (fixed #11411)


git-svn-id: 764b04d0c6fbbea0ee05220aef3208173ff13049@12436 af82e41b-90c4-0310-8c96-b1721e28e2e2

rbaumg/trac,rbaumg/trac,rbaumg/trac,rbaumg/trac