battery throws a DivideByZero error when you enter a wrong accomplishment

[Matt Fischer]

When you misenter an accomplishment, the battery fails as follows:

mfisch@caprica:~/experiments/accomps/ubuntu-community-accomplishments/master$ accomplishments-battery -s general/aasdasda
Getting Accomplishment Data...
['/home/mfisch/experiments/accomps/ubuntu-community-accomplishments/master', '/usr/share/accomplishments']
----- RESULTS -----
Total Scripts: 0
Total Scripts Run: 0 (0 scripts exempted)
Traceback (most recent call last):
  File "/usr/bin/accomplishments-battery", line 29, in <module>
    accomplishments_battery.main()
  File "/usr/lib/python2.7/dist-packages/accomplishments_battery/__init__.py", line 45, in main
    batt.option_test_single(options.single)
  File "/usr/lib/python2.7/dist-packages/accomplishments_battery/battery.py", line 107, in option_test_single
    self.run_scripts()
  File "/usr/lib/python2.7/dist-packages/accomplishments_battery/battery.py", line 587, in run_scripts
    totalcoverage = 100 * (float(totalscriptsrun) / float(self.FINAL_TOTALSCRIPTS))
ZeroDivisionError: float division by zero

I think an error message would be more appropriate.