fix crash with unclean exit

for player, if we're unmounting because we're being deleted, don't bother animating
for tsthreads in general, not much point in removing the threadlist, then checking if it's scaled

Engine/source/T3D/player.cpp

@@ -4604,10 +4604,12 @@ void Player::onUnmount( SceneObject *obj, S32 node )
 
 void Player::unmount()
 {
+
    // Reset back to root position during dismount.  This copies what is
    // done on the server and corrects the fact that the RootAnim change
    // is not sent across to the client using the standard ActionMask.
-   setActionThread(PlayerData::RootAnim,true,false,false);
+   if (!isRemoved())
+      setActionThread(PlayerData::RootAnim,true,false,false);
 
    Parent::unmount();
 }

Engine/source/ts/tsThread.cpp

@@ -534,7 +534,6 @@ void TSShapeInstance::destroyThread(TSThread * thread)
    delete mThreadList[i];
    mThreadList.erase(i);
    setDirty(AllDirtyMask);
-   checkScaleCurrentlyAnimated();
 }
 
 U32 TSShapeInstance::threadCount()