Closing Tab action in lib/actions/header.is cause TypeError

[ppot]

• I am on the latest Hyper.app version
• I have searched the issues of this repo and believe that this is not a duplicate

• OS version and name: macOS Sierra 10.12
• Hyper.app version: 0.8.3
• Relevent information from devtools:

bundle.js:17759 Uncaught TypeError: Cannot read property 'children' of undefined

• The issue is reproducible in vanilla Hyper.app:

Issue

Closing Tab call the CLOSE_TAB event. The event work with a single session opened. With 2 sessions or more There is an error from the dispatch of userExitTermGroup(uid)

Testing this with Tab then 2 session
Term-group UID: "969e616e-fdf9-4ed8-8f7c-d3d599f7cd5a"
Term-group children: [ "ac4105f5-2780-49fa-8b44-68e1aadeefd1", "f92333bf-6bad-4ad7-98fa-32722192f6b9"]

Now in the userExitTermGroup(uid) we can see 2 cases at the end:

        if (group.sessionUid) {
          dispatch(userExitSession(group.sessionUid));
        } else {
          group.children.forEach(childUid => {
            dispatch(userExitTermGroup(childUid));
          });
        }

We can see in the else case that on the new dispatch(userExitTermGroup(childUid));. The group dosen't have children anymore since they where called in the first else pass.

Testing this in my PR I can see that. With a single pane.
I can console.log(onRoot EXIT called)
But with more than one Pane. No action are received.

UPDATE

• After more investigation, it look like the closeTab(i) go for closing the active session but not the - activeTab.
• The current process close only one session and keep others open in the pty.