Crash in MWI parser

Merged Flore Harlé requested to merge fix/crash-mwi-bad-address-on-master into master

In MWI parser, check that the account address is valid before setting it to the MWI in createMessageWaitingIndication(). If the address is NULL or not valid, return nullptr.

(cherry picked from commit cf49f4a1)

linphone-sdk!5013 (merged)

!3570 (merged)

https://linphone.atlassian.net/browse/SDK-534

Edited by Flore Harlé

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