CSR-762 Add back onSubmit function

src/mixins/base-mixin.js

@@ -32,7 +32,7 @@ export default {
     savePageDataToStore(page, data) {
       store.commit(storeMutations.UPDATE_PAGE_DATA, { page: page, data: data });
     },
-    // onSubmit() { }, // DO NOT REMOVE; needed to prevent default form submit behavior
+    onSubmit() { }, // DO NOT REMOVE; needed to prevent default form submit behavior. Cannot use .prevent modifier for vee-validate Form
     onInvalidSubmit({ values, errors, results }) {
       // identify the first error field and put focus on it
       // get error names array