Avoid extra query caused by unsaved event codes

Since not all event codes are saved (for compatibility reasons), such
event codes (e.g. "2 PERIODIC") causes a new param to be created which
results in a DB query to perform clear() operation.

lib/session.coffee

@@ -165,6 +165,10 @@ inform = (sessionContext, rpcReq, callback) ->
 
     toClear = null
     for p in params
+      # Don't need to clear wildcards for Events
+      if p[0][0] == 'Events'
+        device.set(sessionContext.deviceData, p[0], p[1], p[2])
+      else
         toClear = device.set(sessionContext.deviceData, p[0], p[1], p[2], toClear)
 
     clear(sessionContext, toClear, (err) ->