Albert Santoni 0ab1eaa08c Fix account upgrade invoicing issue
* Don't generate upgrade orders if the plan and the billing cycle didn't
  change. WHMCS freaks out otherwise.
* Clean up some deadcode in BillingUpgradeDowngrade.php
* Squash an error in the invoice view if there's no invoices
2014-07-09 13:49:25 -04:00
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