Allow the user to leave some saldos empty when using

create_snapshot.  Blank saldos won't create any saldo rows.

app/controllers/saldos_controller.rb

@@ -62,14 +62,16 @@ class SaldosController < ApplicationController
     ok = true
     @saldos = []
     (0...params[:saldos].to_i).each { |ix|
+      if params[:saldo][ix.to_s][:amount] != ""
         saldo = Saldo.new(params[:saldo][ix.to_s])
         puts ix
-      puts params[:saldo][ix]
+        puts params[:saldo][ix.to_s]
         puts params[:saldo]
         if not saldo.save
           ok = false
         end
         @saldos << saldo
+      end
     }
     if ok
       flash[:notice] = 'Saldos were successfully created.'