Fix crash in ProjectileManager when a sound id fails to play or is not found

apps/openmw/mwworld/projectilemanager.cpp

@@ -280,7 +280,9 @@ namespace MWWorld
         MWBase::SoundManager *sndMgr = MWBase::Environment::get().getSoundManager();
         for (size_t it = 0; it != state.mSoundIds.size(); it++)
         {
-            state.mSounds.push_back(sndMgr->playSound3D(pos, state.mSoundIds.at(it), 1.0f, 1.0f, MWBase::SoundManager::Play_TypeSfx, MWBase::SoundManager::Play_Loop));
+            MWBase::SoundPtr sound = sndMgr->playSound3D(pos, state.mSoundIds.at(it), 1.0f, 1.0f, MWBase::SoundManager::Play_TypeSfx, MWBase::SoundManager::Play_Loop);
+            if (sound)
+                state.mSounds.push_back(sound);
         }
             
         mMagicBolts.push_back(state);
@@ -571,8 +573,10 @@ namespace MWWorld
             
             for (size_t soundIter = 0; soundIter != state.mSoundIds.size(); soundIter++)
             {
-                state.mSounds.push_back(sndMgr->playSound3D(esm.mPosition, state.mSoundIds.at(soundIter), 1.0f, 1.0f,
-                                        MWBase::SoundManager::Play_TypeSfx, MWBase::SoundManager::Play_Loop));
+                MWBase::SoundPtr sound = sndMgr->playSound3D(esm.mPosition, state.mSoundIds.at(soundIter), 1.0f, 1.0f,
+                                                             MWBase::SoundManager::Play_TypeSfx, MWBase::SoundManager::Play_Loop);
+                if (sound)
+                    state.mSounds.push_back(sound);
             }
 
             mMagicBolts.push_back(state);