On a real environment destroying a pending service throws console error

[Jeff Pihach]

Deploy a service using juju-core on ec2, while it's still pending click on the service to open the inspector and then destroy the service.

Uncaught TypeError: Cannot call method 'get' of null handlers.js:174
models.handlers.unitInfo handlers.js:174
(anonymous function) models.js:1121
Y.Base.create.onDelta models.js:1113
Y.Subscriber._notify event-custom-base.js:1295
Y.Subscriber.notify event-custom-base.js:1324
Y.CustomEvent._notify event-custom-base.js:987
Y.CustomEvent._procSubs event-custom-base.js:1113
CEProto.fireComplex event-custom-complex.js:223
Y.CustomEvent._fire event-custom-base.js:1060
ET.fire event-custom-base.js:2215
Y.extend._handleRpcResponse go.js:266
Y.Subscriber._notify event-custom-base.js:1295
Y.Subscriber.notify event-custom-base.js:1324
Y.CustomEvent._notify event-custom-base.js:987
Y.CustomEvent._procSubs event-custom-base.js:1113
CEProto.fireComplex event-custom-complex.js:223
Y.CustomEvent._fire event-custom-base.js:1060
ET.fire event-custom-base.js:2215
(anonymous function) go.js:286
Y.extend.dispatch_result go.js:167
CEProto.fireComplex event-custom-complex.js:337
Y.CustomEvent._fire event-custom-base.js:1060
ET.fire event-custom-base.js:2215
Y.extend.on_message base.js:251
(anonymous function) oop.js:378
ws.onmessage reconnecting-websocket.js:129

[Jeff Pihach (hatch)]

This also appears to happen any time you destroy one of two related services even if they are both green.
Deploy mysql and wordpress, relate them and wait until they are green.
Destroy mysql and watch the console - the error will happen eventually.