feature: add filterObjecNullKeys helper function

app/utils/filterObjectNullKeys.js

@@ -0,0 +1,8 @@
+// @flow
+export default (obj: Object) => Object.keys(obj).reduce((acc, cur) => {
+  if (obj[cur] === null || obj[cur] === undefined || obj[cur] === '') {
+    return acc;
+  }
+
+  return { ...acc, [cur]: obj[cur] };
+}, {});