which kills their use for fallbacks in apps

topic not there

warning TopicNotThere? not found

section not there

warning $section in Tasks not found

neither setion nor topic there

warning, TopicNotThere? not found, so can't look for $section

sven@t42p:/data/trunk/core$ svn diff lib/Foswiki.pm templates/messages.tmpl
Index: lib/Foswiki.pm
===================================================================
--- lib/Foswiki.pm   (revision 2129)
+++ lib/Foswiki.pm   (working copy)
@@ -3484,6 +3484,11 @@
         }
     }
 
+    if ( $interesting and (length($text) eq 0) ) {
+        return _includeWarning( $this, $control{warn}, 'topic_section_not_found',
+                                $includedWeb, $includedTopic, $control{section} );
+    }
+
     # If there were no interesting sections, restore the whole text
     $text = $ntext unless $interesting;
 
Index: templates/messages.tmpl
===================================================================
--- templates/messages.tmpl   (revision 2129)
+++ templates/messages.tmpl   (working copy)
@@ -455,6 +455,7 @@
 %TMPL:DEF{"bad_protocol"}%       %MAKETEXT{"Error: Unsupported protocol. (Must be 'http://domain/...')"}% %TMPL:END%
 %TMPL:DEF{"bad_content"}%        %MAKETEXT{"Error: Unsupported content type: [_1] (Must be =text/html=, =text/plain= or =text/css=)" args="%PARAM1%"}% %TMPL:END%
 %TMPL:DEF{"topic_not_found"}%    %MAKETEXT{"Warning: Can't find topic [_1].[_2]" args="<nop>%PARAM1%, <nop>%PARAM2%"}% %TMPL:END%
+%TMPL:DEF{"topic_section_not_found"}%    %MAKETEXT{"Warning: Can't find named section [_3] in topic [_1].[_2]" args="<nop>%PARAM1%, <nop>%PARAM2%, <nop>%PARAM3%"}% %TMPL:END%
 %TMPL:DEF{"already_included"}%   %MAKETEXT{"Warning: Can't INCLUDE [_1] repeatedly, topic is already included. [_2]" args="<nop>%PARAM1%, %PARAM2%"}% %TMPL:END%
 %TMPL:DEF{"bad_include_path"}%   %MAKETEXT{"Warning: Can't INCLUDE '[_1]', path is empty or contains illegal characters." args="<nop>%PARAM1%"}% %TMPL:END%
 %TMPL:DEF{"generic"}%            %PARAM1% %PARAM2% %PARAM3% %PARAM4% %TMPL:END%

which also inspired Item844

-- SvenDowideit - 23 Jan 2009