Merge pull request #627 from Carreau/100percent

Remove uncovered lines in test.

Author: Carreau

zarr/tests/test_core.py

@@ -139,9 +139,6 @@ def test_nbytes_stored(self):
         except TypeError:
             pass
 
-        if hasattr(z.store, 'close'):
-            z.store.close()
-
     # noinspection PyStatementEffect
     def test_array_1d(self):
         a = np.arange(1050)