When in a bare repo, there is no OID, so don't assume there is.

Author: CKolkey

lua/neogit/lib/git/branch.lua

@@ -375,7 +375,7 @@ local function update_branch_information(state)
   state.head.oid = status.oid
   state.head.detached = status.detached
 
-  if status.oid ~= INITIAL_COMMIT then
+  if status.oid and status.oid ~= INITIAL_COMMIT then
     state.head.abbrev = git.rev_parse.abbreviate_commit(status.oid)
     state.head.commit_message = git.log.message(status.oid)