Fixed "Undefined subroutine &Text::Xslate::Compiler::blessed"

Got this error while coding with `Dancer`, `Dancer::Template::Xslate`, `Dancer::Plugin::DBIC`

    Undefined subroutine &Text::Xslate::Compiler::blessed called at c:/Perl64/site/lib/Text/Xslate/Compiler.pm line 404.