support for Janusgraph 5

[arcticOak2]

It seems like this UI is not supporting Janusgraph 5. For any query with size limit more than 1 in the settings panel, it throws this error. I have not debugged properly but seems like there is a change of response in the new gremlin version (3.4.6) used by Janusgraph 5.

ResponseError: Server error: java.lang.NullPointerException (597)
[0]     at Connection._handleMessage (/Users/abhijeet/eclipse-workspace/opensource/gremlin-visualizer/node_modules/gremlin/lib/driver/connection.js:269:9)
[0]     at WebSocket.<anonymous> (/Users/abhijeet/eclipse-workspace/opensource/gremlin-visualizer/node_modules/gremlin/lib/driver/connection.js:129:43)
[0]     at WebSocket.emit (events.js:321:20)
[0]     at Receiver._receiver.onmessage (/Users/abhijeet/eclipse-workspace/opensource/gremlin-visualizer/node_modules/ws/lib/WebSocket.js:141:47)
[0]     at Receiver.dataMessage (/Users/abhijeet/eclipse-workspace/opensource/gremlin-visualizer/node_modules/ws/lib/Receiver.js:380:14)
[0]     at Receiver.getData (/Users/abhijeet/eclipse-workspace/opensource/gremlin-visualizer/node_modules/ws/lib/Receiver.js:330:12)
[0]     at Receiver.startLoop (/Users/abhijeet/eclipse-workspace/opensource/gremlin-visualizer/node_modules/ws/lib/Receiver.js:165:16)
[0]     at Receiver.add (/Users/abhijeet/eclipse-workspace/opensource/gremlin-visualizer/node_modules/ws/lib/Receiver.js:139:10)
[0]     at Socket.<anonymous> (/Users/abhijeet/eclipse-workspace/opensource/gremlin-visualizer/node_modules/ws/lib/WebSocket.js:138:22)
[0]     at Socket.emit (events.js:321:20)