[kronolith] divide by zero errors .. a lot of them

[Chuck Hagenbuch]

Quoting gauze at dropdead.org:

> I have approximately 1,800 of these errors per second showing up in 
> logs right
> now usong kron 1.1.4

The SQL driver should be more robust in 2.x. If you let me know what 
codeblock this is in, I can check that we'll avoid it in the current 
code too.

-chuck

-- 
"But she goes not abroad in search of monsters to destroy." - John 
Quincy Adams