Bug: able to summon untis of size 0

[DrAtomic1]

Description: when you summon a unit it creates a unit with an unit size of 0.

Reproduce: errr tricky, but I had it happen both with thorns as well as with a single dwarf engineer. Single engineer summons droid and a droid appears with a size of 0. When that droid is hit it dies immediatly as if it doesnt have hit points; i.e. last time I had it happen the 0 unit sized guard droid died on a single hit of 12 points damage. It's like the 'if summon <0 check then summon =1 function' doesnt work or doesnt exist.