don't set the related object if key is null

Author: Andreas Reiterer

lib/shallow-populate.js

@@ -257,12 +257,14 @@ function setItems (data, include, params, response) {
     if (keyHere !== undefined) {
       if (Array.isArray(keyHere)) {
         if (!asArray) {
-          _set(item, nameAs, getRelatedItems(keyHere[0], relatedItems, include, params))
+          const items = getRelatedItems(keyHere[0], relatedItems, include, params)
+          if (items !== undefined) { _set(item, nameAs, items) }
         } else {
           _set(item, nameAs, getRelatedItems(keyHere, relatedItems, include, params))
         }
       } else {
-        _set(item, nameAs, getRelatedItems(keyHere, relatedItems, include, params))
+        const items = getRelatedItems(keyHere, relatedItems, include, params)
+        if (items !== undefined) { _set(item, nameAs, items) }
       }
     }
   })

test/shallow-populate.test.js

@@ -338,7 +338,7 @@ describe('populating thing', () => {
           const response = await shallowPopulate(context)
           const result = response[dataResult]
 
-          assert(!result.posts, `${type}: post should have not been populated`)
+          assert(!Object.prototype.hasOwnProperty.call(result, 'posts'), `${type}: post should have not been populated`)
         }
       })