Valid for Sitecore
5.3
XSLT Renderings Fail due to Null Values in Extension Functions
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According to the latest W3C recommendations, extension functions in XSLT rendering should not return null values, otherwise the rendering fails.
Sitecore 5.3.0 uses XSLT processor which implements the latest W3C recommendations, thus developers should make sure that custom functions do not return null values.