The slaughter task stalls

[Erik Ogenvik]

This is found in the output from cyphesis:

2010-06-19T16:10:05 WARNING Character::TickOperation: Task slaughter has stalled
2010-06-19T16:10:08 ERROR Python error calling "tick_operation"
2010-06-19T16:10:08 SCRIPT_ERROR Traceback (most recent call last):
2010-06-19T16:10:08 SCRIPT_ERROR File "/home/erik/opt/worldforge/share/cyphesis/rulesets/mason/world/tasks/Slaughter.py", line 45, in tick_operation
2010-06-19T16:10:08 SCRIPT_ERROR self.progress = (self.count - target.mass) / self.count
2010-06-19T16:10:08 SCRIPT_ERROR ZeroDivisionError: float division
2010-06-19T16:10:08 ERROR Script for "26180905" has reported an error processing a tick operation. This entity is probably now inactive.

The message is repeated every three seconds.
It's also impossible for a client to connect to the server.
Cyphesis is built from git 2010-04-06.

[Al Riddoch (alriddoch)]

This looks like a corner case which occurred when a pig had a very small mass.

[Al Riddoch (alriddoch)]

I've tweaked the logic to detect and avoid the division by zero.