NullPointerException when closing an Agent which has an HttpLane

[ajay-gov]

Describe the bug
NullPointerException when closing an Agent which has an HttpLane

To Reproduce
Steps to reproduce the behavior:

1. Create an Agent with an HttpLane
2. Call close() on the Agent to see the stacktrace

Additional context
The agent does not recover after this error, i.e commands send to this agent's uri are never received

Log output

java.lang.NullPointerException: Cannot invoke "swim.system.http.RestLaneModel.closeLaneView(swim.api.Lane)" because "this.laneBinding" is null
	at swim.system.http.RestLaneView.close(RestLaneView.java:52)
	at swim.system.LaneModel.willClose(LaneModel.java:532)
	at swim.system.AbstractTierBinding.close(AbstractTierBinding.java:281)
	at swim.system.agent.AgentNode.willClose(AgentNode.java:595)
	at swim.system.agent.AgentModel.willClose(AgentModel.java:582)