CRM-13034 Fix formRule in Main.php to ensure that premium minimum req amount...

CRM-13034 Fix formRule in Main.php to ensure that premium minimum req amount is checked regardless of whether contribution page contains a quick config amount_block OR has membership block or a price set.

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* CRM-13034: Premium minimum price isn't checked if Amounts Block is deselected
  http://issues.civicrm.org/jira/browse/CRM-13034

CRM/Contribute/Form/Contribution/Main.php

@@ -897,9 +897,7 @@ class CRM_Contribute_Form_Contribution_Main extends CRM_Contribute_Form_Contribu
     }
 
     if (isset($fields['selectProduct']) &&
-      $fields['selectProduct'] != 'no_thanks' &&
-      $self->_values['amount_block_is_active']
-    ) {
+      $fields['selectProduct'] != 'no_thanks') {
       $productDAO = new CRM_Contribute_DAO_Product();
       $productDAO->id = $fields['selectProduct'];
       $productDAO->find(TRUE);