Update htmlify.p6 to fix 'got empty filename' issue #1971. #1997
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The problem
issue #1971 'got empty filename' error
Solution provided
htmlify.p6 was looking for "infix C" and tried to process '=head1 baz X<|baz>' same way which results in empty document name. Note 'infix X<C>' is sometimes used so need to check content as well as .type eq 'X'.