Fix ouverture de competence

modules/babele-register.js

@@ -609,6 +609,7 @@ Hooks.once('init', () => {
 
       "mutations_modifier": (value) => { // This is really UGLYYYY i know, but i started like this and discovered afterward that many strings were not easy to automate... Sorry :)
         //console.log("Parsing mutation :", value);
+        if (!value) return;
         value = value.toLowerCase();
         value = value.replace("gain a broken condition if you fail a test derived from ", "Gagnez un état Brisé si vous échouez à un test dérivé de ");
         value = value.replace("weapon skill", "Capacité de Combat");