Issue creating report with pretty.py

[swat30]

Trying to create reports with pretty.py and receiving the following error:
$ python reports/pretty.py --utcdate 2013-05-07
Traceback (most recent call last):
File "reports/pretty.py", line 285, in
too_long)
File "reports/pretty.py", line 214, in make_report
failure_percentage = (float(failure_total)/float(total)) * 100.0
ZeroDivisionError: float division by zero

I know that I have data for today in stacktach:
$ python stacky.py events | wc
16 43 592
$ python stacky.py summary
+---------------------------+---+----------------+----------------+-------------+
| Event | N | Min | Max | Avg |
+---------------------------+---+----------------+----------------+-------------+
| compute.instance.create | 5 | 0d 00:00:23.90 | 0d 00:00:38.85 | 0d 00:00:31 |
| compute.instance.delete | 6 | 0d 00:00:05.13 | 0d 00:00:12.13 | 0d 00:00:08 |
| compute.instance.shutdown | 6 | 0d 00:00:04.74 | 0d 00:00:11.75 | 0d 00:00:08 |
| compute.instance.snapshot | 1 | 0d 00:04:47.87 | 0d 00:04:47.87 | 0d 00:04:47 |
+---------------------------+---+----------------+----------------+-------------+