[py3] Let InstanceCommand.run_arg() always return an int The caller of this method (which is method "run_args") does `max(status, self.run_arg(appid))` and run_arg might return None if the underlying <cmdname>_instance method returns None. On python3 max(1, None) breaks with "TypeError: unorderable types: int() > NoneType()". So we enforce run_arg() method to return an integer even if the underlying method returns None. This fixes call of "cubicweb-ctl i18ninstance" with Python3.

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from yams.constraints import UniqueConstraint

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for rschema in schema.relations():

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    if rschema.rule or not rschema.final:

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        continue

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    for rdef in rschema.rdefs.values():

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        if (rdef.object != 'String'

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                and any(isinstance(cstr, UniqueConstraint) for cstr in rdef.constraints)):

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            table = 'cw_{0}'.format(rdef.subject)

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            column = 'cw_{0}'.format(rdef.rtype)

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            repo.system_source.create_index(cnx, table, column, unique=True)