Notice in pm-updatecode - Undefined index: 7.x-1.0-alpha1 in pm_project_filter()

Notice: Undefined index: 7.x-1.0-alpha1 in pm_project_filter() (line 519 of /Users/mw/c/h/drush/commands/pm/updatecode.pm.inc).

To reproduce it:

drush dl devel-7.x-1.0-alpha1
drush en devel -y
drush pm-updatecode devel