#1904. Don't crash if a write to a client fails, which can happen som…

…etimes when a client has left but some data is still buffered.

lib/mmsh-client-session.js

@@ -58,7 +58,11 @@ module.exports.MMSHClientSession = function(stream, verifyIsIDUnique) {
 	    response.write(header_bin);
 	    this.data_handler = function(data_packet, repacked_data) {
 		log.debug(c, this.client_id + ": sending data packet to attached client...");
-		response.write(repacked_data);
+		try {
+		    response.write(repacked_data);
+		} catch(e) {
+		    // client disconnected, otherwise unavailable.  happens sometimes when clients disconnected and there's some buffering going on.
+		}
 	    }.bind(this);
 	    stream.on("Data", this.data_handler);
 	    req.socket.once("close", function(if_error) {