Bug 14673: Work around change to AddIssue return

Bug 14673: Work around change to AddIssue return

Return from AddIssue used to be due date or undef.
Now it is less straightforward returning am issue object
if an issue row is created or undef. If the issue is a renewal
undef is returned. As that case was not handled properly it
caused the server site to crash the listener causing a
communications error on the client.

Signed-off-by: Frederic Demians <f.demians@tamil.fr>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>