Make sure `options` field exists on select field.

platforms/hubspot/hubspot-email-adapter.js

@@ -98,7 +98,9 @@ export function convertToHubspotField(field = {}) {
       });
     case 'select':
       const options = [];
-      Object.keys(field.options).forEach(value => options.push([value, field.options[value]]));
+      if (field.options) {
+        Object.keys(field.options).forEach(value => options.push([value, field.options[value]]));
+      }
 
       return Object.assign({}, data, {
         type: "choice",