Extension functions cannot return null values.

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Extension functions cannot return null values.





[XslTransformException: Extension functions cannot return null values.]
System.Xml.Xsl.Runtime.XmlQueryRuntime.ChangeTypeXsltResult(XmlQueryType xmlType, Object value) +1002628
System.Xml.Xsl.Runtime.XmlQueryContext.InvokeXsltLateBoundFunction(String name, String namespaceUri, IList`1[] args) +830
(20)(XmlQueryRuntime {urn:schemas-microsoft-com:xslt-debug}runtime, XPathNavigator {urn:schemas-microsoft-com:xslt-debug}current, IList`1 catg) +5488
(XmlQueryRuntime {urn:schemas-microsoft-com:xslt-debug}runtime, XPathNavigator {urn:schemas-microsoft-com:xslt-debug}current) +5003
Root(XmlQueryRuntime {urn:schemas-microsoft-com:xslt-debug}runtime) +33
Execute(XmlQueryRuntime {urn:schemas-microsoft-com:xslt-debug}runtime)…

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