[Asterisk-code-review] app_read: Fix null pointer crash (asterisk[18])

[George Joseph]

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George Joseph has removed a vote from this change. ( https://gerrit.asterisk.org/c/asterisk/+/16549 )


Change subject: app_read: Fix null pointer crash
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Gerrit-Project: asterisk
Gerrit-Branch: 18
Gerrit-Change-Id: Ie941833e123c3dbfb88371b5de5edbbe065514ac
Gerrit-Change-Number: 16549
Gerrit-PatchSet: 4
Gerrit-Owner: N A <mail at interlinked.x10host.com>
Gerrit-Reviewer: Friendly Automation
Gerrit-Reviewer: George Joseph <gjoseph at digium.com>
Gerrit-Reviewer: Joshua Colp <jcolp at sangoma.com>
Gerrit-Attention: N A <mail at interlinked.x10host.com>
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