[1.9.x] Fixed #26557 -- Converted empty strings to None when saving GenericIPAddressField.

Backport of 4681d65048ca2553895e10c2c492997b0a78ffba from master

1 files changed, 1 insertions, 1 deletions

diff --git a/django/db/backends/base/operations.py b/django/db/backends/base/operations.py
index acca12708a..5d3cddff9d 100644
--- a/django/db/backends/base/operations.py
+++ b/django/db/backends/base/operations.py
@@ -497,7 +497,7 @@ class BaseDatabaseOperations(object):
         Transforms a string representation of an IP address into the expected
         type for the backend driver.
         """
-        return value
+        return value or None
 
     def year_lookup_bounds_for_date_field(self, value):
         """