Howard Gao cd551bfba0 ARTEMIS-1389 Add non-null check to ServerSessionImpl.doClose()
An Openwire connection creates an internal session used to track
transaction status, it doesn't have a session callback. When
the connection is closed, the core session should check if
callback is null to avoid NPE.
2017-09-05 16:16:33 -04:00
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