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python: Treat None-return of greeting cmd

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In case qemu process dies the "monitor.cmd" returns None which gets
passed to the "__negotiate_capabilities" and leads to unhandled
exception. Let's only check the resp in case it has a value.

Signed-off-by: Lukáš Doktor <ldoktor@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
Message-Id: <20200120071202.30646-1-ldoktor@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
This commit is contained in:
Lukáš Doktor 2020-01-20 08:12:02 +01:00 committed by Philippe Mathieu-Daudé
parent a1e8bd2f5c
commit 52c68b8abb
1 changed files with 1 additions and 1 deletions
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2
python/qemu/qmp.py
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@ -80,7 +80,7 @@ def __negotiate_capabilities(self):
raise QMPConnectError
# Greeting seems ok, negotiate capabilities
resp = self.cmd('qmp_capabilities')
if "return" in resp:
if resp and "return" in resp:
return greeting
raise QMPCapabilitiesError