tests: remove useless tearDown() definitions

Author: zas

test/test_metadata.py

@@ -102,9 +102,6 @@ def setUp(self):
         def get_metadata_object():
             pass
 
-        def tearDown(self):
-            pass
-
         def test_metadata_setitem(self):
             self.assertEqual(["single1-value"], self.metadata.getraw("single1"))
             self.assertEqual(["single2-value"], self.metadata.getraw("single2"))

test/test_plugins.py

@@ -105,9 +105,6 @@ def setUp(self):
         super().setUp()
         logging.disable(logging.ERROR)
 
-    def tearDown(self):
-        pass
-
 
 class TestPicardPluginsCommonTmpDir(TestPicardPluginsCommon):