Engine may spawn ships with zero health

[Google Code Exporter]

In campaign 4 (Op Firestorm), there's a big enemy installation. When it's 
destroyed, a single fighter with zero health is spawned, which is 
indestructible, thus rendering the mission unbeatable.

Original issue reported on code.google.com by [e-mail] on 7 Jun 2012 at 5:03

[Google Code Exporter]

Need to add a check to ship::ExecFrame to trigger self-destruct in this case

Original comment by [e-mail] on 2 Jul 2012 at 12:36

• Changed state: Started

[Google Code Exporter]

Also need to make sure that ships drop targets once they go to zero health or 
are in the death spiral mode

Original comment by [e-mail] on 2 Jul 2012 at 12:45