[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

lib/iris/tests/unit/data_manager/test_DataManager.py

@@ -649,7 +649,7 @@ def test_with_lazy_array(self):
 class Test_is_dataless(tests.IrisTest):
     def setUp(self):
         self.data = np.array(0)
-        self.shape = (0, )
+        self.shape = (0,)
 
     def test_with_data(self):
         dm = DataManager(self.data)