[Asterisk-code-review] app_dial: Fix dial status regression. (asterisk[master])

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Hello George Joseph, Friendly Automation, 

I'd like you to reexamine a change. Please visit

    https://gerrit.asterisk.org/c/asterisk/+/18521

to look at the new patch set (#4).

Change subject: app_dial: Fix dial status regression.
......................................................................

app_dial: Fix dial status regression.

ASTERISK_28638 caused a regression by incorrectly aborting
early and overwriting the status on certain calls.
This was exhibited by certain technologies such as DAHDI,
where DAHDI returns NULL for the request if a line is busy.
This caused the BUSY condition to be incorrectly treated
as CHANUNAVAIL because the DIALSTATUS was getting incorrectly
overwritten and call handling was aborted early.

This is fixed by instead checking if any valid peers have been
specified, as opposed to checking the list size of successful
requests. This is because the latter could be empty but this
does not indicate any kind of problem. This restores the
previous working behavior.

ASTERISK-29989 #close

Change-Id: I4d4b209b967816b1bc791534593ababa2b99bb88
---
M apps/app_dial.c
1 file changed, 5 insertions(+), 2 deletions(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/21/18521/4
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Gerrit-Project: asterisk
Gerrit-Branch: master
Gerrit-Change-Id: I4d4b209b967816b1bc791534593ababa2b99bb88
Gerrit-Change-Number: 18521
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-CC: Joshua Colp <jcolp at sangoma.com>
Gerrit-Attention: N A <mail at interlinked.x10host.com>
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Gerrit-Attention: George Joseph <gjoseph at digium.com>
Gerrit-MessageType: newpatchset
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