Fixed PDF build error
requested to merge ayanokouzi-guest/debian-handbook:stretch/master/issue/01_fix_pdf_buid_error into stretch/master
Causes of error:
- After XSLT (xsltproc), all TEXT nodes in source XML files were included in 'user.params.set' and 'user.params.set2' blocks of debian-handbook.tex file
Handling:
- Suppress inclusion of TEXT nodes to the blocks
- Add validation and cleaning of generated PDF
Test:
- Text from the XML files are removed from these blocks but others are remained