PadMessageHandler: Don't fill in default name or color
PadMessageHandler: Don't fill in default name or color

It should be the client's responsibility to handle null name or color.
In the case of author names, passing null to the client allows users
to fill in the names of other users (via a suggestUserName
CLIENT_MESSAGE).

storytouch/etherpad-lite,ether/etherpad-lite,ether/etherpad-lite,ether/etherpad-lite,storytouch/etherpad-lite,storytouch/etherpad-lite