Fix for bug 2711:

Blocks upgrade no longer breaks in Postgres. Also, a "hell why not"
robustness addition to the MySQL upgrade.

blocks/db/mysql.php

@@ -68,7 +68,7 @@ global $CFG;
                         `id` int(10) not null auto_increment,
                         `blockid` int(10) not null default '0',
                         `pageid` int(10) not null default '0',
-                        `pagetype` enum('course') not null,
+                        `pagetype` varchar(12) not null default '',
                         `position` enum('l', 'r') not null,
                         `weight` tinyint(3) not null default '0',
                         `visible` tinyint(1) not null default '0',

blocks/db/postgres7.php

@@ -70,7 +70,7 @@ global $CFG;
                         id SERIAL8 PRIMARY KEY,
                         blockid INT8 not null default '0',
                         pageid INT8 not null default '0',
-                        pagetype varchar(12) not null check (pagetype in ('course')),
+                        pagetype varchar(12) not null default '',
                         position char not null check (position in ('l', 'r')) ,
                         weight int not null default '0',
                         visible int not null default '0',