fix syntax error

django_code/website_redirection/apps.py

@@ -35,7 +35,7 @@ def display_key(request,key):
 
 def redirect_to_key(request,key):
     value = r.get(key)
-    if !(value):
+    if value == None:
         return render(request, 'blank_page.html',{})
     else:
         print(value)