Fix None value receiced.

git-svn-id: https://redmine.imt-atlantique.fr/svn/xaal/code/Python/trunk@2197 b32b6428-25c9-4566-ad07-03861ab6144f

devices/protocols/KNX/xaal/knx/bindings.py

@@ -21,11 +21,13 @@ def on_off(attribute,dpt,data):
 
 def round_(attribute,dpt,data):
     val = dpts.decode[dpt](data)
-    attribute.value = round(val)
+    if val!=None:
+        attribute.value = round(val)
 
 def set_(attribute,dpt,data):
     val = dpts.decode[dpt](data)
-    attribute.value = val
+    if val!=None:
+        attribute.value = val
 
 funct = {
     "bool"     : bool_,
@@ -33,4 +35,4 @@ funct = {
     "round"    : round_,
     "set"      : set_,
     "on_off"   : on_off,
-}
\ No newline at end of file
+}