xmlseclibs: Fix processing of references with URI="" and URI="#..." with a WithComments canonicalization.
xmlseclibs: Fix processing of references with URI="" and URI="#..." with a WithComments canonicalization.


madmatt/saml2,newmen/saml2,sitya/saml2,ArtemTeleshev/php-saml2,sgomez/saml2,cb8/saml2,simplesamlphp/saml2