notunique and notempty support
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@ -70,9 +70,16 @@ class Base:
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properties = frozenset()
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elif isinstance(properties, tuple):
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properties = frozenset(properties)
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if is_multi and 'empty' not in properties:
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# if option is a multi, it cannot be "empty" (None not allowed in the list)
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# "empty" is removed for follower's option
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if is_multi:
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# if option is a multi, it cannot be 'empty' (None not allowed in the list) and cannot have multiple time the same value
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# 'empty' and 'unique' are removed for follower's option
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if 'notunique' in properties:
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properties = properties - {'notunique'}
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else:
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properties = properties | {'unique'}
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if 'notempty' in properties:
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properties = properties - {'notempty'}
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else:
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properties = properties | {'empty'}
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assert isinstance(properties, frozenset), _('invalid properties type {0} for {1},'
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' must be a frozenset').format(type(properties),
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