UPDATE setOrtb user ids to avoid passing an empty array when no user ids present (#9875)

Co-authored-by: Alejandro Villanueva <[email protected]>

Author: ialex

modules/userId/index.js

@@ -1085,7 +1085,7 @@ module('userId', attachIdSystem);
 
 export function setOrtbUserExtEids(ortbRequest, bidderRequest, context) {
   const eids = deepAccess(context, 'bidRequests.0.userIdAsEids');
-  if (eids) {
+  if (eids && Object.keys(eids).length > 0) {
     deepSetValue(ortbRequest, 'user.ext.eids', eids);
   }
 }

test/spec/ortbConverter/userId_spec.js

@@ -18,4 +18,16 @@ describe('pbjs - ortb user eids', () => {
     setOrtbUserExtEids(req, {}, [{}]);
     expect(req).to.eql({});
   })
+
+  it('has no effect if user.ext.eids is an empty array', () => {
+    const req = {};
+    setOrtbUserExtEids(req, {}, {
+      bidRequests: [
+        {
+          userIdAsEids: []
+        }
+      ]
+    });
+    expect(req).to.eql({});
+  });
 })