Merge branch '1.0-maintenance'

flask/blueprints.py

@@ -10,6 +10,7 @@
     :license: BSD, see LICENSE for more details.
 """
 from functools import update_wrapper
+from werkzeug.urls import url_join
 
 from .helpers import _PackageBoundObject, _endpoint_from_view_func
 
@@ -49,8 +50,6 @@ class BlueprintSetupState(object):
         url_prefix = self.options.get('url_prefix')
         if url_prefix is None:
             url_prefix = self.blueprint.url_prefix
-        if url_prefix:
-            url_prefix = url_prefix.rstrip('/')
         #: The prefix that should be used for all URLs defined on the
         #: blueprint.
         self.url_prefix = url_prefix
@@ -66,7 +65,11 @@ class BlueprintSetupState(object):
         blueprint's name.
         """
         if self.url_prefix is not None:
-            rule = '/'.join((self.url_prefix, rule.lstrip('/')))
+            if rule:
+                rule = '/'.join((
+                    self.url_prefix.rstrip('/'), rule.lstrip('/')))
+            else:
+                rule = self.url_prefix
         options.setdefault('subdomain', self.subdomain)
         if endpoint is None:
             endpoint = _endpoint_from_view_func(view_func)

flask/cli.py

@@ -825,6 +825,10 @@ def routes_command(sort, all_methods):
     """Show all registered routes with endpoints and methods."""
 
     rules = list(current_app.url_map.iter_rules())
+    if not rules:
+        click.echo('No routes were registered.')
+        return
+
     ignored_methods = set(() if all_methods else ('HEAD', 'OPTIONS'))
 
     if sort in ('endpoint', 'rule'):