Support factory taking no damage bug

[Aulex]

When any support factory upgrades from t1 to t2, there is a health bar that regenerates at which the factory upgrades, this is seen by an opponent. When the opponent attacks the support fac, the damage done to that building is dealt to the upgrading health bar. When the support factory finishes upgrading its health is set to full. Also if the damage being done causes the upgrading health bar to reach 0 the factory restarts the upgrade while the t1 factory takes no damage, i.e. causing an infinite mass drain. This may happen to other support factories at different tiers but that is the only type i have tested.