Fix a problem about Japanese PDFs without embedded fonts
Added a test PDF having Identity-H encoding without embedded font
Support corrupted pdfs that are encrypted but lack 'ID' in trailer
Merge pull request #2562 from vyv03354/master

Fix a problem about Japanese PDFs without embedded fonts
Merge pull request #2547 from mduan/issue2085

Support corrupted pdfs that are encrypted but lack 'ID' in trailer