Address admin error message when calling zen_get_customid

This has appeared on the admin side when reviewing orders, but it may appear elsewhere in the admin if the function is called when the item is not tracked by SBA.  So, added a function to identify if a product is tracked by SBA as well as an escape from the zen_get_customid function if the product is not tracked by SBA.

admin/includes/classes/products_with_attributes_stock.php

@@ -724,7 +724,16 @@ function zen_get_customid($products_id, $attributes = null) {
   	$customid_model_query = null;
   	$customid_query = null;
   	$products_id = zen_get_prid($products_id);
-
+
+    if (!$this->zen_product_is_sba($products_id)) {
+      $no_attribute_stock_query = 'SELECT products_model
+                                   FROM ' . TABLE_PRODUCTS . '
+                                   WHERE products_id = :products_id:';
+      $no_attribute_stock_query = $db->bindVars($no_attribute_stock_query, ':products_id:', $products_id, 'integer');
+      $customid = $db->Execute($no_attribute_stock_query);
+
+      return $customid->fields['products_model'];
+    } 
   	// check if there are attributes for this product
  	  $stock_has_attributes_query = 'select products_attributes_id 
   											from '.TABLE_PRODUCTS_ATTRIBUTES.' 
@@ -836,4 +845,35 @@ function zen_get_customid($products_id, $attributes = null) {
   	}
   }//end of function
 
+  function zen_product_is_sba($product_id) {
+    global $db;
+
+    if (!isset($product_id) && !is_numeric(zen_get_prid($product_id))) {
+      return null;
+    }
+
+    $inSBA_query = 'SELECT * 
+                    FROM information_schema.tables
+                    WHERE table_schema = :your_db:
+                    AND table_name = :table_name:
+                    LIMIT 1;';
+    $inSBA_query = $db->bindVars($inSBA_query, ':your_db:', DB_DATABASE, 'string');
+    $inSBA_query = $db->bindVars($inSBA_query, ':table_name:', TABLE_PRODUCTS_WITH_ATTRIBUTES_STOCK, 'string');
+    $SBA_installed = $db->Execute($inSBA_query, false, false, 0, true);
+
+    if (!$SBA_installed->EOF && $SBA_installed->RecordCount() > 0) {
+      $isSBA_query = 'SELECT stock_id FROM ' . TABLE_PRODUCTS_WITH_ATTRIBUTES_STOCK . ' where products_id = :products_id:;';
+      $isSBA_query = $db->bindVars($isSBA_query, ':products_id:', $product_id, 'integer');
+      $isSBA = $db->Execute($isSBA_query);
+
+      if (!$isSBA->EOF && $isSBA->RecordCount() > 0) {
+        return true;
+      } else {
+        return false;
+      }
+    }
+
+    return false;
+  }
+
 }//end of class