scripts/qmp-shell: initialize completer early

Add an empty completer as a more type-safe placeholder instead of
'None'.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 20210607200649.1840382-26-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
1 file changed