Do not try to launch magic bolt when direction to target is empty (bug #5350)

CHANGELOG.md

@@ -211,6 +211,7 @@
     Bug #5326: Formatting issues in the settings.cfg
     Bug #5328: Skills aren't properly reset for dead actors
     Bug #5345: Dopey Necromancy does not work due to a missing quote
+    Bug #5350: An attempt to launch magic bolt causes "AL error invalid value" error
     Bug #5352: Light source items' duration is decremented while they aren't visible
     Feature #1774: Handle AvoidNode
     Feature #2229: Improve pathfinding AI

apps/openmw/mwworld/projectilemanager.cpp

@@ -291,6 +291,12 @@ namespace MWWorld
         if (state.mEffects.mList.empty())
             return;
 
+        if (!caster.getClass().isActor() && fallbackDirection.length2() <= 0)
+        {
+            Log(Debug::Warning) << "Unable to launch magic bolt (direction to target is empty)";
+            return;
+        }
+
         MWWorld::ManualRef ref(MWBase::Environment::get().getWorld()->getStore(), state.mIdMagic.at(0));
         MWWorld::Ptr ptr = ref.getPtr();