[FAB-17726] Properly handle malformed gossip envelopes #1037
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If a malformed envelope is read from the stream, an error is propagated
synchronously up the stack.
However, the envelope is unmarshaled into a nil
message which is also propagated further up the stack asynchronously.
Under very rare circumstances, the error is picked up later than
the message, and a nil pointer panic occurs.
This patch fixes this by returning early in case of an error.
Change-Id: Ia17767ec2483d83d5fa4e7e22514c539232108a8
Signed-off-by: yacovm yacovm@il.ibm.com