bugfix in nested formset due to changes in templates that changed the position...

bugfix in nested formset due to changes in templates that changed the position of the input, searching not only in children

ippisite/ippidb/static/js/wizard_formset_with_nested_formset.js

@@ -23,7 +23,11 @@ function add_nested_form_to_nested_formset(source, prefix, parent_prefix){
         .find(".formset-nested-item")[0]
         .outerHTML;
 
-    current_item_name = $(source).closest(".formset-item").children("input")[0].name;
+    if($(source).closest(".formset-item").children("input").length>0){
+        current_item_name = $(source).closest(".formset-item").children("input")[0].name;
+    }else{
+        current_item_name = $(source).closest(".formset-item").children("div").children("input")[0].name;
+    }
     current_item_name = current_item_name.substring(parent_prefix.length+1,current_item_name.indexOf('-',parent_prefix.length+1));
     empty_form_as_str = empty_form_as_str.replace(
         new RegExp(parent_prefix+"-__prefix__","g"),