[Asterisk-code-review] app_read: Fix null pointer crash (asterisk[16.21])

[George Joseph]

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Change subject: app_read: Fix null pointer crash
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Gerrit-Project: asterisk
Gerrit-Branch: 16.21
Gerrit-Change-Id: Ie941833e123c3dbfb88371b5de5edbbe065514ac
Gerrit-Change-Number: 16555
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Gerrit-Reviewer: George Joseph <gjoseph at digium.com>
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