Fix crash when stealing items with the owner not around (Fixes #1512)

apps/openmw/mwmechanics/mechanicsmanagerimp.cpp

@@ -827,6 +827,8 @@ namespace MWMechanics
         // NOTE: int arg can be from itemTaken() so DON'T modify it, since it is
         //  passed to reportCrime later on in this function.
 
+        // NOTE: victim may be empty
+
         // Only player can commit crime
         if (player.getRefData().getHandle() != "player")
             return false;
@@ -860,7 +862,7 @@ namespace MWMechanics
         mActors.getObjectsInRange(from, radius, neighbors);
 
         // victim should be considered even beyond alarm radius
-        if (from.squaredDistance(Ogre::Vector3(victim.getRefData().getPosition().pos)) > radius*radius)
+        if (!victim.isEmpty() && from.squaredDistance(Ogre::Vector3(victim.getRefData().getPosition().pos)) > radius*radius)
             neighbors.push_back(victim);
 
         int id = MWBase::Environment::get().getWorld()->getPlayer().getNewCrimeId();

apps/openmw/mwmechanics/mechanicsmanagerimp.hpp

@@ -111,6 +111,7 @@ namespace MWMechanics
             /**
              * @brief Commit a crime. If any actors witness the crime and report it,
              *        reportCrime will be called automatically.
+             * @note victim may be empty
              * @param arg Depends on \a type, e.g. for Theft, the value of the item that was stolen.
              * @return was the crime reported?
              */