[s3] catch 404 when deleting objects (#1201)

storages/backends/s3boto3.py

@@ -446,16 +446,24 @@ def _save(self, name, content):
         return cleaned_name
 
     def delete(self, name):
-        name = self._normalize_name(clean_name(name))
-        self.bucket.Object(name).delete()
+        try:
+            name = self._normalize_name(clean_name(name))
+            self.bucket.Object(name).delete()
+        except ClientError as err:
+            if err.response['ResponseMetadata']['HTTPStatusCode'] == 404:
+                # Not an error to delete something that does not exist
+                return
+
+            # Some other error was encountered. Re-raise it
+            raise
 
     def exists(self, name):
         name = self._normalize_name(clean_name(name))
         try:
             self.connection.meta.client.head_object(Bucket=self.bucket_name, Key=name)
             return True
-        except ClientError as error:
-            if error.response['ResponseMetadata']['HTTPStatusCode'] == 404:
+        except ClientError as err:
+            if err.response['ResponseMetadata']['HTTPStatusCode'] == 404:
                 return False
 
             # Some other error was encountered. Re-raise it.

tests/test_s3boto3.py

@@ -485,6 +485,24 @@ def test_storage_delete(self):
         self.storage.bucket.Object.assert_called_with('path/to/file.txt')
         self.storage.bucket.Object.return_value.delete.assert_called_with()
 
+    def test_storage_delete_does_not_exist(self):
+        self.storage.bucket.Object('file.txt').delete.side_effect = ClientError(
+            {'Error': {}, 'ResponseMetadata': {'HTTPStatusCode': 404}},
+            'DeleteObject',
+        )
+        self.storage.delete('file.txt')
+        # No problem
+
+    def test_storage_delete_other_error_reraise(self):
+        self.storage.bucket.Object('file.txt').delete.side_effect = ClientError(
+            {'Error': {}, 'ResponseMetadata': {'HTTPStatusCode': 403}},
+            'DeleteObject',
+        )
+        with self.assertRaises(ClientError) as cm:
+            self.storage.delete('file.txt')
+
+        self.assertEqual(cm.exception.response['ResponseMetadata']['HTTPStatusCode'], 403)
+
     def test_storage_listdir_base(self):
         # Files:
         #   some/path/1.txt