Gerrit git cl land: abort if not uploaded.

git_cl.py

Index: git_cl.py
diff --git a/git_cl.py b/git_cl.py
index 6cfb4bedb8a5e90b5f50a52258bffb90e51e1c83..a11004953222dad96fe29bbaf7cbefa72a78dac7 100755
--- a/git_cl.py
+++ b/git_cl.py
@@ -4009,6 +4009,10 @@ def SendUpstream(parser, args, cmd):
           'the contributor\'s "name <email>". If you can\'t upload such a '
           'commit for review, contact your repository admin and request'
           '"Forge-Author" permission.')
+    if not cl.GetIssue():
+      DieWithError('You must upload the issue first to Gerrit.\n'
+                   '  If you would rather have `git cl land` upload '
+                   'automatically for you, see http://crbug.com/642759')
     return cl._codereview_impl.CMDLand(options.force, options.bypass_hooks,
                                        options.verbose)