Add voterIdentities to copy again and fix issue if there was no body in the response (in the case of unknown voters election)

cmd/web/handlers.go

@@ -104,6 +104,7 @@ func (app *application) CreateElection(w http.ResponseWriter, r *http.Request) {
 			app.serverError(w, r, err)
 			return
 		}
+		w.Header().Set("Content-Type", "application/json")
 	}
 
 	w.Header().Set("Location", fmt.Sprintf("/election/%v", electionId))
@@ -290,6 +291,7 @@ func (app *application) GetElectionResults(w http.ResponseWriter, r *http.Reques
 		return
 	}
 
+	w.Header().Set("Content-Type", "application/json")
 	w.Write(response)
 }