Fixed #13335: Adjusted the r12950 fix to properly handle import errors resulting from nested calls to load_app.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@12972 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/admin_scripts/complex_app/admin/foo.py

@@ -0,0 +1,3 @@
+from django.contrib import admin
+from admin_scripts.complex_app.models.foo import Foo
+admin.site.register(Foo)

tests/regressiontests/admin_scripts/complex_app/models/__init__.py

@@ -0,0 +1,4 @@
+from admin_scripts.complex_app.models.bar import Bar
+from admin_scripts.complex_app.models.foo import Foo
+
+__all__ = ['Foo', 'Bar']

tests/regressiontests/admin_scripts/complex_app/models/bar.py

@@ -0,0 +1,7 @@
+from django.db import models
+
+from ..admin import foo
+class Bar(models.Model):
+    name = models.CharField(max_length=5)
+    class Meta:
+        app_label = 'complex_app'

tests/regressiontests/admin_scripts/complex_app/models/foo.py

@@ -0,0 +1,6 @@
+from django.db import models
+
+class Foo(models.Model):
+    name = models.CharField(max_length=5)
+    class Meta:
+        app_label = 'complex_app'