cyverse / atmosphere / 815

36%

master: 37%

Pull #533

travis-ci

Guard against division by zero

When an image has not be launched, we hit `total_launched = 0` and then
the percentage calculation will throw:
...
>>> ZeroDivisionError: float division by zero

This sets the percent to `0.0` and only does the division if we have
launches.

Note: when trying to test or reproduce this, you might need to do a
clear of the redis cache for these calculations to be performed:

$ redis-cli flushall

One image that did *not* have launced in my local test envirionment was
- https://local.atmo.cloud/application/images/1468

971 of 6950 branches covered (13.97%)

Branch coverage included in aggregate %.

3 of 3 new or added lines in 1 file covered. (100.0%)

11590 of 27950 relevant lines covered (41.47%)

0.8 hits per line