try/catch to allow chef to run from prod file

src/web/RecipeWaiter.mjs

@@ -561,6 +561,8 @@ class RecipeWaiter {
             this.ingredientChildRuleID = null;
 
             // Find relevant rules in the stylesheet
+            // try/catch for chrome 64+ CORS error on cssRules.
+            try {
                 for (const i in document.styleSheets[0].cssRules) {
                     if (document.styleSheets[0].cssRules[i].selectorText === ".ingredients") {
                         this.ingredientRuleID = i;
@@ -569,6 +571,9 @@ class RecipeWaiter {
                         this.ingredientChildRuleID = i;
                     }
                 }
+            } catch (e) {
+                // Do nothing.
+            }
         }
 
         if (!this.ingredientRuleID || !this.ingredientChildRuleID) return;