[FIX] Fix warning: undefined array key on tiki-view_tracker and undefined variable on pdflib

• [FIX] Fix warning: undefined array key on tiki-view_tracker and undefined variable on pdflib

Fixing undefined array key and undefined variable on tiki-view_tracker and pdflib

issues: https://app.glitchtip.com/evoludata/issues/4767093 https://app.glitchtip.com/evoludata/issues/2422079