Index: openacs-4/www/blank-master.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/www/blank-master.tcl,v
diff -u -r1.56.2.10 -r1.56.2.11
--- openacs-4/www/blank-master.tcl	12 Sep 2016 18:08:38 -0000	1.56.2.10
+++ openacs-4/www/blank-master.tcl	21 Jul 2017 14:05:58 -0000	1.56.2.11
@@ -176,7 +176,14 @@
 # page (that might require a list of the HTML IDs of all affected
 # textareas).
 #
-::template::util::richtext::render_widgets
+# We check whether render_widgets command exists, as during a release
+# upgrade this could be missing and would prevent any further action
+# on the system after installing new code
+if {[info proc ::template::util::richtext::render_widgets] ne ""} {
+    ::template::util::richtext::render_widgets
+} else {
+    ns_log warning "::template::util::richtext::render_widgets not defined. Richtext widgets won't work. Try restarting the server."
+}
 
 #
 # Get the basic content info like title and charset for the head of