Statistics for Classes Do Not Render in Full

Problem/Motivation

Statistics for classes created cannot render. Both training progress and training completion show 0%. Nothing to select for year and month.

Steps to reproduce

As an administrator click Click

Management -> Classes -> Click any of the added classes to view its statistics

Proposed resolution

Class statistics should show like those of the trainings in the catalogue where all details including the statistics breakdown and users in the class are clearly shown.

Remaining tasks

User interface changes

API changes

Data model changes