added came_from to login.jinja2

cao_blogr/views/default.py

@@ -33,7 +33,6 @@ def apropos(request):
 @view_config(route_name='login', renderer='cao_blogr:templates/login.jinja2')
 @forbidden_view_config(renderer='cao_blogr:templates/login.jinja2')
 def login(request):
-    username = ''
     login_url = request.route_url('login')
 
     referrer = request.url
@@ -41,9 +40,11 @@ def login(request):
         referrer = '/' # never use the login form itself as came_from
     
     came_from = request.params.get('came_from', referrer)
-    username = request.POST.get('username')
-    userpwd = request.POST.get('password')
-    if username:
+    username = ''
+    userpwd = ''
+    if 'form.submitted' in request.params:
+        username = request.POST.get('username')
+        userpwd = request.POST.get('password')
         user = UserService.by_name(request, username)
         if user and user.verify_password(userpwd):
             headers = remember(request, username)