With an empty data log; usage percentage fails with a devide by 0

[Myles Metzler]

Calculating a percentage of time in a specified mode requires time to have passed (need at least two sample points!) In cases where the calculated time passed is 0 set the percentage of time in all modes to 0%

[Myles Metzler]

bugfixes

resolves #80 (default configuration pages fails loading) resolves #81 (w/ no log data; recent query fails) resolves #82 (w/ no log data; trend stats request fails)

→ <<cset dc4ef479ed29>>

[Myles Metzler]

Pending pull request.

[Myles Metzler]

Merged in dev-bugfix (pull request #4)

fixes #80 (default configuration pages fails loading) fixes #81 (w/ no log data; recent query fails) fixes #82 (w/ no log data; trend stats request fails) fixes #84 (demo mode allows log delete) fixes #85 (needed let causing issues with older browsers)

Approved-by: Myles Metzler [e-mail]

→ <<cset 67776b40e955>>