Added session validation to open cash register

app/views/cash_outs/index.html.erb

@@ -44,7 +44,7 @@
                     <span class="caption-subject bold uppercase">Lista de cortes de caja</span>
                   </div>
                    <div class="actions">
-                    <% if can? :create, OpenCashRegister %>
+                    <% if can? :create, OpenCashRegister && !session[:open_cash_register_id].present? %>
                       <%= link_to new_open_cash_register_path, remote: true, class: 'btn btn bold green margin-top pull-right', title: "Abrir caja registradora" do %> Abrir caja <i class="fa fa-plus"></i><% end %> <br>
                     <% end %>
                     <% if can? :get_open_cash_registers, CashOut %>