From 1b82bbdfc0eeaa5b654de96c5bb5a42d248efc79 Mon Sep 17 00:00:00 2001
From: Chris Mayo <aklhfex@gmail.com>
Date: Sun, 28 Jul 2024 18:39:03 +0100
Subject: [PATCH] Fix KeyError exception when flask-babel is installed but not
 used

flask-babel's gettext() expects a Babel object to have been created.

Otherwise an exception is raised.

  File "/usr/lib/python3.12/site-packages/flask_babel/__init__.py", line 46, in get_babel
    return app.extensions['babel']
           ~~~~~~~~~~~~~~^^^^^^^^^
KeyError: 'babel'
---
 flask_admin/babel.py | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/flask_admin/babel.py b/flask_admin/babel.py
index 762ccb2ee..6195c3151 100644
--- a/flask_admin/babel.py
+++ b/flask_admin/babel.py
@@ -1,7 +1,14 @@
+from flask import current_app, has_app_context
+
 try:
     from flask_babel import Domain
 
-except ImportError:
+    if has_app_context():
+        current_app().extensions['babel']
+    else:
+        raise KeyError
+
+except (KeyError, ImportError):
     def gettext(string, **variables):
         return string % variables