Fix issues with a recent refactoring

test/test_evaluate/test_sys_path.py

@@ -11,7 +11,7 @@ from jedi import Script
 def test_paths_from_assignment():
     def paths(src):
         script = Script(src, path='/foo/bar.py')
-        expr_stmt = script._get_module_node().children[0]
+        expr_stmt = script._module_node.children[0]
         return set(sys_path._paths_from_assignment(script._get_module(), expr_stmt))
 
     assert paths('sys.path[0:0] = ["a"]') == {'/foo/a'}