Multisets produce one element unquoted

Rev: lib/modules/Sql.pmod/sql_util.pmod:1.24

lib/modules/Sql.pmod/sql_util.pmod

 /*
- * $Id: sql_util.pmod,v 1.23 2008/06/30 12:09:15 srb Exp $
+ * $Id: sql_util.pmod,v 1.24 2008/06/30 12:10:32 srb Exp $
  *
  * Some SQL utility functions.
  * They are kept here to avoid circular references.
@@ -51,7 +51,8 @@ string emulate_bindings(string query, mapping(string|int:mixed)|void bindings,
 	lambda(mixed m) {
           if(zero_type(m))
             return "NULL";
-	  if(multisetp(m)) m = indices(m)[0];
+	  if(multisetp(m))
+	    return sizeof(m) ? indices(m)[0] : "";
 	  return "'"+(intp(m)?(string)m:my_quote((string)m))+"'";
 	});
   // Throws if mapping key is empty string.