added check for null process.root that arises when a process in the w…

[johnnyhh]

…orkQueue is killed.

If I call Process.kill on a process in the workQueue, the process's root is set to null, but it stays in the workQueue, leading to a runtime error in step() at the line var ctor = process.root.ctor. This bug pops up quite frequently in when I kill a process whose task (http request) has completed, but not yet been processed and removed from the workQueue.

[process-bot]

Thanks for the pull request! Make sure it satisfies this checklist. My human colleagues will appreciate it!

Here is what to expect next, and if anyone wants to comment, keep these things in mind.

[process-bot]

Thanks for the pull request! Make sure it satisfies this checklist. My human colleagues will appreciate it!

Here is what to expect next, and if anyone wants to comment, keep these things in mind.

[evancz]

You need to provide an http://sscce.org that uses elm-lang/core version 4.0.5. This issue should have been fixed in a much nicer way in that patch release.

If you can provide an http://sscce.org as an issue, we can then think about how to best fix the issue.

[evancz]

You need to provide an http://sscce.org that uses elm-lang/core version 4.0.5. This issue should have been fixed in a much nicer way in that patch release.

If you can provide an http://sscce.org as an issue, we can then think about how to best fix the issue.