Multi enhancements, including auto serialization, product editing

modules/invoice/classes/model/invoice.php

@@ -445,9 +445,13 @@ class Model_Invoice extends ORMOSB {
 		// If our value is null, we'll remove it.
 		if (is_null($value) AND isset($remind[$key]))
 			unset($remind[$key]);
-		elseif ($add)
+		elseif ($add) {
+			if (! is_array($a=$remind[$key]))
+				$remind[$key] = array($a);
+
 			$remind[$key][] = $value;
-		else
+
+		} else
 			$remind[$key] = $value;
 
 		$this->reminders = serialize($remind);