undo change 4138 (#4149)

Author: kddejong

src/cfnlint/config.py

@@ -777,8 +777,9 @@ def templates(self):
             filenames = cli_alt_args
         elif cli_args:
             filenames = cli_args
-        elif not sys.stdin.isatty():
-            return []
+        # elif not sys.stdin.isatty():
+        #    if (select.select([sys.stdin], [], [], 0.0)[0]):
+        #        return []
         elif file_args:
             filenames = file_args
         else:

test/unit/module/runner/test_cli.py

@@ -79,7 +79,8 @@ def test_print_help(self, mock_isatty, mock_print_help):
 
         self.assertEqual(e.exception.code, 1)
         mock_print_help.assert_called_once()
-        self.assertEqual(mock_isatty.call_count, 2)
+        mock_isatty.assert_called_once()
+        # self.assertEqual(mock_isatty.call_count, 2)
 
     def test_bad_regions(self):
         config = ConfigMixIn(