don't update doc with an empty object (no $set)
don't update doc with an empty object (no $set)

You were erasing existing fields (full splat) rather then updating the doc with $set.

**in conflictHandler before ddp.msg switch**

DDP Object {
  msg: "added”, 
  collection: "groups”, 
  id: "Wg3mXjjsNCqinwdGi”, 
  fields: {
     name: “testing
  }
}
“doc" Object {name: "testing”}

**in conflictHandler - added **
"fields" Object {}

** UpdateLogic - changed ** 
args:
_id: Wg3mXjjsNCqinwdGi 
fields: Object {} 

in monitorChanges - added 
“doc" Object {_id: "Wg3mXjjsNCqinwdGi"}

in browser console
Group.findOne()
Object {_id: "Wg3mXjjsNCqinwdGi"}
GroundMeteor/db