Removed unused attribute app_errors of the app cache.

get_app_errors() always returned an empty dictionary; this behavior is
preserved in django.db.models.loading until that module is deprecated.

django/apps/cache.py

@@ -35,9 +35,6 @@ def _initialize():
         # May contain apps that are not installed.
         app_models=OrderedDict(),
 
-        # Mapping of app_labels to errors raised when trying to import the app.
-        app_errors={},
-
         # Pending lookups for lazy relations
         pending_lookups={},
 
@@ -223,11 +220,6 @@ class BaseAppCache(object):
         finally:
             imp.release_lock()
 
-    def get_app_errors(self):
-        "Returns the map of known problems with the INSTALLED_APPS."
-        self._populate()
-        return self.app_errors
-
     def get_models(self, app_mod=None,
                    include_auto_created=False, include_deferred=False,
                    only_installed=True, include_swapped=False):

django/core/management/validation.py

@@ -32,9 +32,6 @@ def get_validation_errors(outfile, app=None):
 
     e = ModelErrorCollection(outfile)
 
-    for (app_name, error) in app_cache.get_app_errors().items():
-        e.add(app_name, error)
-
     for cls in app_cache.get_models(app, include_swapped=True):
         opts = cls._meta
 

django/db/models/loading.py

@@ -17,9 +17,19 @@ get_app_package = app_cache.get_app_package
 get_app_path = app_cache.get_app_path
 get_app_paths = app_cache.get_app_paths
 get_app = app_cache.get_app
-get_app_errors = app_cache.get_app_errors
 get_models = app_cache.get_models
 get_model = app_cache.get_model
 register_models = app_cache.register_models
 load_app = app_cache.load_app
 app_cache_ready = app_cache.app_cache_ready
+
+
+# This method doesn't return anything interesting in Django 1.6. Maintain it
+# just for backwards compatibility until this module is deprecated.
+def get_app_errors():
+    try:
+        return app_cache.app_errors
+    except AttributeError:
+        app_cache._populate()
+        app_cache.app_errors = {}
+        return app_cache.app_errors