# HG changeset patch
# User Ludovic Chabant <ludovic@chabant.com>
# Date 1508227736 25200
# Node ID a0a62d0da7237363d2806f2fd361401c52c5d867
# Parent  72f17534d58ed60c7c8f96040898b95a8b859c21
internal: Check that the `Assetor` has an asset URL format to work with.

diff -r 72f17534d58e -r a0a62d0da723 piecrust/data/assetor.py
--- a/piecrust/data/assetor.py	Tue Oct 17 01:07:30 2017 -0700
+++ b/piecrust/data/assetor.py	Tue Oct 17 01:08:56 2017 -0700
@@ -81,6 +81,8 @@
         app = source.app
         root_dir = app.root_dir
         asset_url_format = app.config.get('site/asset_url_format')
+        if not asset_url_format:
+            raise Exception("No asset URL format was specified.")
 
         page_uri = self._page.getUri()
         pretty_urls = app.config.get('site/pretty_urls')