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notify_if_empty

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   Usages of this macro
... in register.naml
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<macro name="notify_if_empty" requires="field">
    <n.if
Binary
Namespace: BasicNamespace
Parameters: condition, else, then
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.is_empty
Binary
Namespace: BasicNamespace
Parameters: value
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.value
Binary
Namespace: FieldNamespace
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>
        <then.throw_template_exception
Binary
Namespace: BasicNamespace
Parameters: name
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 name="empty_registration_field"/>
    </n.if.is_empty.value>
</macro>
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