Fixes falling though map when using charge on a hill.

Source/Game/Chat/Commands/MMapsCommands.cs

@@ -207,7 +207,7 @@ namespace Game.Chat
             for (int i = 0; i < navmesh.getMaxTiles(); ++i)
             {
                 Detour.dtMeshTile tile = navmesh.getTile(i);
-                if (tile == null)
+                if (tile.header == null)
                     continue;
 
                 tileCount++;

Source/Game/Movement/Generators/PathGenerator.cs

@@ -991,7 +991,7 @@ namespace Game.Movement
             // ok, _pathPoints[i] is too close, _pathPoints[i-1] is not, so our target point is somewhere between the two...
             //   ... settle for a guesstimate since i'm not confident in doing trig on every chase motion tick...
             // (@todo review this)
-            _pathPoints[i] += (_pathPoints[i - 1] - _pathPoints[i]).directionOrZero() * (dist - (_pathPoints[i] - target).Length());
+            _pathPoints[i] += (_pathPoints[i - 1] - _pathPoints[i]).direction() * (dist - (_pathPoints[i] - target).Length());
             Array.Resize(ref _pathPoints, i + 1);
         }