[gnome-builder] rustup: be careful about accessing GLib.Error params

[Christian Hergert <chergert src gnome org>]

commit 26a3c3a9a26d9ee47745d702de1c92046c06d390
Author: Christian Hergert <chergert redhat com>
Date:   Sun Mar 19 16:33:45 2017 -0700

    rustup: be careful about accessing GLib.Error params
    
    In case we get a regular exception without a .code attribute. Also use
    the IOErrorEnum for the cancelled constant.

 plugins/rustup/rustup_plugin/__init__.py |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/plugins/rustup/rustup_plugin/__init__.py b/plugins/rustup/rustup_plugin/__init__.py
index c20ea91..9ca26cb 100644
--- a/plugins/rustup/rustup_plugin/__init__.py
+++ b/plugins/rustup/rustup_plugin/__init__.py
@@ -423,11 +423,10 @@ class RustupInstaller(Ide.Transfer):
                 task.return_boolean(False)
 
         except Exception as ex:
-            # cancelled error
-            if ex.code is 19:
+            if getattr(ex, 'code') == Gio.IOErrorEnum.CANCELLED:
                 self.props.status = _('Cancelled')
             else:
-                print('_wait_cb', ex, ex.code)
+                print('_wait_cb', repr(ex))
             task.return_boolean(False)
         RustupApplicationAddin.instance.check_rustup()