[Client] Rework MechanicsHelper::getTarget() to avoid crashes

apps/openmw/mwmp/MechanicsHelper.cpp

@@ -97,7 +97,10 @@ MWWorld::Ptr MechanicsHelper::getPlayerPtr(const Target& target)
 mwmp::Target MechanicsHelper::getTarget(const MWWorld::Ptr& ptr)
 {
     mwmp::Target target;
+    clearTarget(target);
 
+    if (ptr != nullptr)
+    {
         if (ptr == MWBase::Environment::get().getWorld()->getPlayerPtr())
         {
             target.isPlayer = true;
@@ -120,8 +123,7 @@ mwmp::Target MechanicsHelper::getTarget(const MWWorld::Ptr& ptr)
                 target.mpNum = ptrRef->getMpNum();
                 target.name = ptr.getClass().getName(ptr);
             }
-        else
+        }
-            clearTarget(target);
     }
 
     return target;