Remove useless code

`to_unicode` variable was created but was not used.
(cherry picked from commit 69fcabb335130bd0f6e9889c5b191c68192559b5)

diff --git a/lib/sqlalchemy/sql/sqltypes.py b/lib/sqlalchemy/sql/sqltypes.py
index 7e2e601e27fc5bdb1ec92feb29f7eb3b5c0c3005..7bf1572892ce9db6bf822510f02ecbc431502bf4 100644 (file)
--- a/lib/sqlalchemy/sql/sqltypes.py
+++ b/lib/sqlalchemy/sql/sqltypes.py
@@ -215,9 +215,6 @@ class String(Concatenable, TypeEngine):
             self.convert_unicode != 'force_nocheck'
         )
         if needs_convert:
-            to_unicode = processors.to_unicode_processor_factory(
-                dialect.encoding, self.unicode_error)
-
             if needs_isinstance:
                 return processors.to_conditional_unicode_processor_factory(
                     dialect.encoding, self.unicode_error)