Handle cleanly failure to push to try.

trychooser

@@ -461,7 +461,10 @@ For all questions, choosing Y means adding something to the TryChooser string. C
     ui.write(_("View the results of your push at http://tbpl.mozilla.org/?tree=Try&rev=%s\n") % (repo[None].p1()))
 
     ui.write(_("Push to try server...\n"))
-    commands.push(ui, repo, "ssh://hg.mozilla.org/try", force=True)
+    try:
+      commands.push(ui, repo, "ssh://hg.mozilla.org/try", force=True)
+    except:
+      ui.write("ERROR: failed to push to try server!\n");
 
     # In Mercurial 2.1 phases support was added, and until Mozilla updates to
     # this version and configures the try repository to be non-publishing, we