Adjust condition for return link.
Merge pull request #776 from wangguan59/back_page

Back link condition in exercise page
Changing version for 0.10.2
Clear any existing user summary from DOM when rendering new graph.

Fix for #622
Fix for #464

When no users exist for Scatter and Timeline coach reports, show an error message instead of drawing an empty chart.
Update scatter and timeline no user error to use standard error communication.
Re-introduce fix that disappeared. Convert facilities in coachreports form data to ids.
Merge branch 'coach_reports_UI_fixes' of github.com:rtibbles/ka-lite into release-0.10.2