Breaking a conspiracy of bugs

There were a couple bugs that interacted to create a nasty suprise:

• If a castle has a Captain, but no spells, then the game would crash during castle combat when either player tried to cast a spell
• Mage guilds built in the Ironfist Map Editor contain no spells.

These combined to make a lot of castle battles crash, but have both been fixed. Thanks again to “theRatt!”