Implemented only show menu if bills available, closes #25

locales/fr.lua

@@ -3,6 +3,7 @@ Locales['fr'] = {
   ['invoices_item'] = '$%s',
   ['received_invoice'] = 'vous avez ~r~reçu~s~ une facture',
   ['paid_invoice'] = 'vous avez ~g~payé~s~ une facture de ~r~$%s~s~',
+  ['no_invoices'] = 'you do not have any bills to pay at this moment',
   ['received_payment'] = 'vous avez ~g~reçu~s~ un paiement de ~g~$%s~s~',
   ['player_not_online'] = 'le joueur n\'est pas connecté',
   ['no_money'] = 'you do not have enough money to pay this bill',