null non explicite pour surligner explication #7

items.py

@@ -119,7 +119,8 @@ class Item:
             res['miseEnAction'] = self.miseEnAction.mid
         if self.explication != None:
             res['explication'] = self.explication.mid
-            res['surlignerExplication'] = self.surlignerExplication
+            if self.surlignerExplication:
+                res['surlignerExplication'] = self.surlignerExplication
         if self.transition != None:
             res['transition'] = self.transition.mid
         res['randomiser'] = self.randomiser