Catch a touchMove error

[att55]

Related issue

#1180

Overview

Multiple touch by using like MicroSoft Surface or Tablets causes a touchMove error.
The error makes stf service down.
In order to avoid service down, catch the error.

/usr/lib/node_modules/stf/node_modules/protobufjs/dist/ProtoBuf.js:2641
                    throw Error("Illegal value for "+this.toString(true)+" of type "+this.type.name+": "+val+" ("+msg+")");
                    ^

Error: Illegal value for Message.Field .TouchMoveMessage.contact of type uint32: undefined (not an integer)
    at Field.<anonymous> (/usr/lib/node_modules/stf/node_modules/protobufjs/dist/ProtoBuf.js:2641:27)
    at Field.ProtoBuf.Reflect.FieldPrototype.verifyValue (/usr/lib/node_modules/stf/node_modules/protobufjs/dist/ProtoBuf.js:2675:29)
    at MessagePrototype.set (/usr/lib/node_modules/stf/node_modules/protobufjs/dist/ProtoBuf.js:1799:63)
    at new Message (/usr/lib/node_modules/stf/node_modules/protobufjs/dist/ProtoBuf.js:1728:42)
    at Socket.<anonymous> (/usr/lib/node_modules/stf/lib/units/websocket/index.js:466:31)
    at emitTwo (events.js:126:13)
    at Socket.emit (events.js:214:7)
    at /usr/lib/node_modules/stf/node_modules/socket.io/lib/socket.js:528:12
    at _combinedTickCallback (internal/process/next_tick.js:132:7)
    at process._tickCallback (internal/process/next_tick.js:181:9)

[koral--]

Thanks! I've added a note what is this catch for.