Small bugfixes

plugins/dummy/__init__.py

 __author__ = "Lodel2 dev team"
 __fullname__ = "Dummy plugin"
 __name__ = 'yweber.dummy'
+__plugin_type__ = 'extension'
 
 
 ##@brief This methods allow plugin writter to write some checks

plugins/webui/run.py

 #@return None or a session token
 def load_cookie(request):
     token = request.cookies.get(COOKIE_SESSION_ID)
-    token=token.encode()
+    
     if token is None or len(token) == 0:
         return None
+    
+    token=token.encode()
+    
     hashtok = request.cookies.get(COOKIE_SESSION_HASH)
     if hashtok is None:
         raise ClientAuthenticationFailure(