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.

vivekrajenderan/simplesamlphp,vivekrajenderan/simplesamlphp,tectronics/simplesamlphp,tectronics/simplesamlphp,tectronics/simplesamlphp,vivekrajenderan/simplesamlphp,tectronics/simplesamlphp,vivekrajenderan/simplesamlphp,tectronics/simplesamlphp,vivekrajenderan/simplesamlphp