Index: openacs-4/packages/forums/lib/message/row.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/forums/lib/message/row.tcl,v
diff -u -r1.7 -r1.8
--- openacs-4/packages/forums/lib/message/row.tcl	5 Jun 2007 17:33:50 -0000	1.7
+++ openacs-4/packages/forums/lib/message/row.tcl	6 Jun 2007 17:02:43 -0000	1.8
@@ -17,6 +17,10 @@
     set rownum 1
 }
 
+if {![exists_and_not_null presentation_type]} {
+    set presentation_type ""
+}
+
 set message(content) [ad_html_text_convert -from $message(format) -to text/html -- $message(content)]
 set message(screen_name) $screen_name