Issue 7461 - Include source page into warning text for unresolved links

cms/sources.py

Index: cms/sources.py
===================================================================
--- a/cms/sources.py
+++ b/cms/sources.py
@@ -22,17 +22,17 @@
 from random import randint
 import urlparse
 import logging
 
 from cms import utils
 
 
 class Source:
-    def resolve_link(self, url, locale):
+    def resolve_link(self, url, locale, source_page=None):
         parsed = urlparse.urlparse(url)
         page = parsed.path
         if parsed.scheme != '' or page.startswith('/') or page.startswith('.'):
             # Not a page link
             return None, None
 
         if url.startswith('tel:'):
             # Workaround for 'tel' scheme not recognized in Python <=2.7.3.
@@ -54,17 +54,18 @@
             if not self.has_locale(locale, page):
                 locale = default_locale
         elif self.has_page(alternative_page):
             if not self.has_locale(locale, alternative_page):
                 locale = default_locale
         elif self.has_static(page):
             locale = None
         else:
-            logging.warning('Link to %s cannot be resolved', page)
+            logging.warning('Link to "%s" (from "%s") cannot be resolved',
+                            page, source_page)
 
         parts = page.split('/')
         if parts[-1] == default_page:
             page = '/'.join(parts[:-1])
         if locale:
             path = '/{}/{}'.format(locale, page)
             return locale, urlparse.urlunparse(parsed[0:2] + (path,) + parsed[3:])
         return locale, '/' + page