fixed problem with get_app when app does not exist

VERSION

@@ -1 +1 @@
-Version 2.6.0-development+timestamp.2013.08.23.14.37.05
+Version 2.6.0-development+timestamp.2013.08.23.14.45.37

applications/admin/controllers/default.py

@@ -86,7 +86,8 @@ def safe_write(a, value, b='w'):
 
 def get_app(name=None):
     app = name or request.args(0)
-    if (app and os.path.exists(os.path.join(os.path.dirname(request.folder),app)) and
+    folder = request.folder if not request.folder.endswith('/') else request.folder[:-1]
+    if (app and os.path.exists(os.path.join(os.path.dirname(folder),app)) and
         (not MULTI_USER_MODE or is_manager() or
          db(db.app.name == app)(db.app.owner == auth.user.id).count())):
         return app