Fix negative power

git-svn-id: https://redmine.imt-atlantique.fr/svn/xaal/code/Python/branches/0.7@2687 b32b6428-25c9-4566-ad07-03861ab6144f

devices/protocols/ZWave/xaal/zwave/products/AeonLabs/ZW096.py

@@ -30,4 +30,6 @@ class ZW096(core.ZDevice):
             self.devices[0].attributes['power']=value.data
 
         if value == self.get_value('power'):
-            self.devices[1].attributes['power']=round(value.data)
+            power = round(value.data)
+            if power >= 0:
+                self.devices[1].attributes['power']=power