Remove fast path

Author: AA-Turner

Lib/test/test_textwrap.py

@@ -9,7 +9,6 @@
 #
 
 import unittest
-from test.support import warnings_helper
 
 from textwrap import TextWrapper, wrap, fill, dedent, indent, shorten
 
@@ -770,9 +769,7 @@ def test_type_error(self):
         with self.assertRaisesRegex(TypeError, "expected str object, not"):
             dedent(0)
 
-        # Suppress BytesWarning
-        with (warnings_helper.check_warnings(('', BytesWarning), quiet=True),
-              self.assertRaisesRegex(TypeError, "expected str object, not")):
+        with self.assertRaisesRegex(TypeError, "expected str object, not"):
             dedent(b'')
 
     def assertUnchanged(self, text):

Lib/textwrap.py

@@ -426,9 +426,6 @@ def dedent(text):
 
     Entirely blank lines are normalized to a newline character.
     """
-    if text == '':
-        return text
-
     try:
         lines = text.split('\n')
     except (AttributeError, TypeError):