Add null protection to LodRenderer

src/main/java/backsun/lod/renderer/LodRenderer.java

@@ -67,6 +67,12 @@ public class LodRenderer
 			return;
 		}
 		
+		if (regions == null)
+		{
+			// if there aren't any loaded LodChunks
+			// don't try drawing anything
+			return;
+		}