Index: openacs-4/packages/xowiki/tcl/xowiki-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/xowiki-procs.tcl,v
diff -u -N -r1.542.2.47 -r1.542.2.48
--- openacs-4/packages/xowiki/tcl/xowiki-procs.tcl	10 Oct 2019 10:28:23 -0000	1.542.2.47
+++ openacs-4/packages/xowiki/tcl/xowiki-procs.tcl	11 Oct 2019 17:32:11 -0000	1.542.2.48
@@ -4708,7 +4708,11 @@
   FormPage instproc include_header_info {{-prefix ""} {-js ""} {-css ""}} {
     if {$css eq ""} {set css [:get_from_template ${prefix}_css]}
     if {$js eq ""}  {set js [:get_from_template ${prefix}_js]}
-    foreach line [split $js \n] {::xo::Page requireJS [string trim $line]}
+    foreach line [split $js \n] {
+      if {[llength $line] > 1} {
+        ::xo::Page requireJS [string trim $line]
+      }
+    }
     foreach line [split $css \n] {
       set line [string trim $line]
       set order 1