[GL] ~QuadTree: It is safe to delete nullptr.

GeoLib/QuadTree.h

@@ -71,9 +71,9 @@ public:
 	 */
 	~QuadTree()
 	{
-		if (_is_leaf)
-			for (std::size_t k(0); k < 4; k++)
-				delete _childs[k];
+		for (std::size_t k(0); k < 4; k++) {
+			delete _childs[k];
+		}
 	}
 
 	/**