[FAB-3207] fix JoinChan fails at event publish failing
[FAB-3207] fix JoinChan fails at event publish failing

If the event publishing fails, the join channel also fails.
This shouldn't be so, because an event publishing might fail because
a subscriber is reading too slow from the stream.

Change-Id: I82202d478a12b555f6c7f63a52580c607ca3b15d
Signed-off-by: Yacov Manevich <632344b5da9bd743456189af4db4b56472defb8c@il.ibm.com>

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