modinfo nullable and without default.

lib/db/mysql.php

@@ -2169,6 +2169,10 @@ function main_upgrade($oldversion=0) {
         table_column('capabilities', '', 'riskbitmask', 'INTEGER', '10', 'unsigned', '0', 'not null', '');
     }
 
+    if ($oldversion < 2006083100) {
+        execute_sql("ALTER TABLE {$CFG->prefix}course CHANGE modinfo modinfo longtext NULL AFTER showgrades");
+    }
+
     return $result;
 }
 

lib/db/mysql.sql

@@ -53,7 +53,7 @@ CREATE TABLE `prefix_course` (
   `summary` text NOT NULL default '',
   `format` varchar(10) NOT NULL default 'topics',
   `showgrades` smallint(2) unsigned NOT NULL default '1',
-  `modinfo` longtext NOT NULL default '',
+  `modinfo` longtext,
   `newsitems` smallint(5) unsigned NOT NULL default '1',
   `teacher` varchar(100) NOT NULL default 'Teacher',
   `teachers` varchar(100) NOT NULL default 'Teachers',

lib/db/postgres7.php

@@ -1764,6 +1764,11 @@ function main_upgrade($oldversion=0) {
         table_column('capabilities', '', 'riskbitmask', 'INTEGER', '10', 'unsigned', '0', 'not null', '');
     }
 
+    if ($oldversion < 2006083100) {
+        execute_sql("ALTER TABLE {$CFG->prefix}course ALTER COLUMN modinfo DROP NOT NULL");
+        execute_sql("ALTER TABLE {$CFG->prefix}course ALTER COLUMN modinfo DROP DEFAULT");
+    }
+
     return $result;
 }
 

lib/db/postgres7.sql

@@ -24,7 +24,7 @@ CREATE TABLE prefix_course (
    summary text NOT NULL default '',
    format varchar(10) NOT NULL default 'topics',
    showgrades integer NOT NULL default '1',
-   modinfo text NOT NULL default '',
+   modinfo text,
    newsitems integer NOT NULL default '1',
    teacher varchar(100) NOT NULL default 'Teacher',
    teachers varchar(100) NOT NULL default 'Teachers',