try/catch to allow chef to run from prod file

src/web/RecipeWaiter.mjs

@@ -561,13 +561,18 @@ class RecipeWaiter {
             this.ingredientChildRuleID = null;
 
             // Find relevant rules in the stylesheet
-            for (const i in document.styleSheets[0].cssRules) {
-                if (document.styleSheets[0].cssRules[i].selectorText === ".ingredients") {
-                    this.ingredientRuleID = i;
-                }
-                if (document.styleSheets[0].cssRules[i].selectorText === ".ingredients > div") {
-                    this.ingredientChildRuleID = i;
+            // 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;
+                    }
+                    if (document.styleSheets[0].cssRules[i].selectorText === ".ingredients > div") {
+                        this.ingredientChildRuleID = i;
+                    }
                 }
+            } catch (e) {
+                // Do nothing.
             }
         }