[geary/geary-0.12] Fix assertion failure if there are messages in the outbox on startup. Bug 727679.

[Michael Gratton <mjog src gnome org>]

commit 8961bf339fe8972f4dcc781d8ad150a1bc56dedf
Author: Alex Henrie <alexhenrie24 gmail com>
Date:   Wed Jul 12 23:06:49 2017 -0600

    Fix assertion failure if there are messages in the outbox on startup. Bug 727679.
    
    * src/engine/imap/api/imap-account.vala
      (Geary.Imap.Account.create_folder_async): Ensure that
      this.hierarchy_delimiter has been initialized before using it.

 src/engine/imap/api/imap-account.vala |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/engine/imap/api/imap-account.vala b/src/engine/imap/api/imap-account.vala
index 6f44c23..14c1b0e 100644
--- a/src/engine/imap/api/imap-account.vala
+++ b/src/engine/imap/api/imap-account.vala
@@ -257,7 +257,8 @@ private class Geary.Imap.Account : BaseObject {
     
     public async void create_folder_async(FolderPath path, Cancellable? cancellable) throws Error {
         check_open();
-        
+        yield claim_session_async(cancellable);
+
         StatusResponse response = yield send_command_async(new CreateCommand(
             new MailboxSpecifier.from_folder_path(path, this.hierarchy_delimiter)), null, null, cancellable);