[django/django] dcb4ed: Fixed #22975: Don't call rename SQL if not needed

[GitHub]

Branch: refs/heads/master
Home: https://github.com/django/django
Commit: dcb4ed517082d13ccf7da9bd5d16c77bcecbf139
https://github.com/django/django/commit/dcb4ed517082d13ccf7da9bd5d16c77bcecbf139
Author: Andrew Godwin <and...@aeracode.org>
Date: 2014-07-21 (Mon, 21 Jul 2014)

Changed paths:
M django/db/backends/schema.py
M tests/migrations/test_operations.py

Log Message:
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Fixed #22975: Don't call rename SQL if not needed