Mapping an object to array of objects in ES6

How would I convert a object to an array of objects while keeping key names?

// actual 
obj = {
  key1: null,
  key2: "Nelly",
  key3: [ "suit", "sweat" ]
} 

// expected 
arr = [
  { key2: "Nelly" },
  { key3: [ "suit", "sweat" ] }
]

currently my solution is...

 var arr = Object.keys(obj).map(key => { if (obj[key]) return { key: obj[key] } });

which returns

arr = [
  undefined,
  { key: "Nelly" },
  { key: [ "suit", "sweat" ] }
]