Realm crash if deleteRealmIfMigrationNeeded = true and the Realm is open in the Browser

[dmorrow]

If I am using the Realm Browser and use the deleteRealmIfMigrationNeeded = true configuration with a migration, Realm will crash on the next build.

Perhaps there is a way to reopen the Browser window, or alert the user and disconnect the Realm session?

I reported the issue to the Realm Cocoa project (realm/realm-swift#5118), but I think it belongs here

[stel]

Thanks for reporting this issue @dmorrow! Will see what we can do here..