[#6239] Fix artifact links in emails

RelativeLinkRewriter short-circuits unless PATH_INFO ends with /

Signed-off-by: Tim Van Steenburgh <tvansteenburgh@gmail.com>
diff --git a/Allura/allura/command/taskd.py b/Allura/allura/command/taskd.py
index 505935a..f75f01b 100644
--- a/Allura/allura/command/taskd.py
+++ b/Allura/allura/command/taskd.py
@@ -122,7 +122,7 @@
                             only=only)
                     if self.task:
                         # Build the (fake) request
-                        r = Request.blank('/--%s--/%s' % (self.task.task_name, self.task._id),
+                        r = Request.blank('/--%s--/%s/' % (self.task.task_name, self.task._id),
                                           {'task': self.task,
                                            'wsgi.errors': wsgi_error_log,  # ErrorMiddleware records error details here
                                            })