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H A Dcommands.pyec9697ab Mon Feb 01 13:37:32 CST 2021 John Snow <jsnow@redhat.com> qapi/commands: assert arg_type is not None

When boxed is True, expr.py asserts that we must have
arguments. Ultimately, this should mean that if boxed is True that
arg_type should be defined. Mypy cannot infer this, and does not support
'stateful' type inference, e.g.:

```
if x:
assert y is not None

...

if x:
y.etc()
```

does not work, because mypy does not statefully remember the conditional
assertion in the second block. Help mypy out by creating a new local
that it can track more easily.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20210201193747.2169670-2-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>