Template st:module now better supports unbound variables

tetras_extraction/script/templates/module.rq

@@ -9,8 +9,7 @@ template mt:module(?mod) {
     format {
         """+++
 title = "%s"
-weight = %s0
-bookCollapseSection = true
+%sbookCollapseSection = true
 +++
 
 # %1$s
@@ -21,7 +20,7 @@ bookCollapseSection = true
         # (not explicitly documented but confirmed from testing), including
         # "%1$" position specifiers, which allows reusing the 1st param by index
         ?title
-        ?weight
+        coalesce(st:format("weight = %s\n", ?weight * 10), "")
     } st:nl()
 
     group {
@@ -42,6 +41,8 @@ bookCollapseSection = true
 
     # Module / section attributes
     ?mod :titre ?title .
+    optional {
         ?mod :index ?index .
         bind(?index + 1 as ?weight)
     }
+}