pdf.js library is not installed. Please install it from here and place in libraries/ folder

Problem/Motivation

Steps to reproduce

If you go to Site Error Reports, you will be seeing an requirement error for the pdf.js library :
Slide activity pdf.js library is not installed. Please install it from here and place in libraries/ folder

Proposed resolution

I have applied the below patch to remove this error, since the pdf.js is not available in the structure (libraries/pdf.js/build/pdf.js) that is mentioned on the opigno_module_requirements function in opigno_module.install file.
opigno_module_pdfjs_error.patch →