Refactor add-contributor component to DDAU

app/utils/cps/is-present.js

@@ -0,0 +1,8 @@
+import computed from 'ember-computed';
+import { isPresent } from 'ember-utils';
+
+export default function(key) {
+  return computed(key, function() {
+    return isPresent(this.get(key));
+  });
+}