[Migrations] Added checks to see if things exists. Done to avoid trouble when swapping branches.

application/migrations/076_theme_table.php

@@ -5,6 +5,7 @@ class Migration_Theme_table extends CI_Migration {
 	public function up()
 	{
 		// create themes table
+		if (!$this->db->table_exists('themes')) {
 			$this->db->query("create table themes (id integer not null auto_increment, name varchar(256) not null, foldername varchar(256) not null, primary key (id)) ENGINE=myisam DEFAULT CHARSET=utf8;");
 			$this->db->query("INSERT INTO themes (name, foldername) values ('Blue','blue');");
 			$this->db->query("INSERT INTO themes (name, foldername) values ('Cosmo','cosmo');");
@@ -13,9 +14,9 @@ class Migration_Theme_table extends CI_Migration {
 			$this->db->query("INSERT INTO themes (name, foldername) values ('Default','default');");
 			$this->db->query("INSERT INTO themes (name, foldername) values ('Superhero (Dark)','superhero');");
         }
+	}
 
 	public function down(){
 		$this->db->query("");
-
 	}
 }

application/migrations/077_add_userid_to_notes.php

@@ -9,8 +9,10 @@ class Migration_add_userid_to_notes extends CI_Migration
 			'user_id BIGINT(20) DEFAULT NULL',
 		);
 
+		if (!$this->db->field_exists('user_id', 'notes')) {
 			$this->dbforge->add_column('notes', $fields);
 		}
+	}
 
 	public function down()
 	{

application/migrations/078_add_userid_to_hardware.php

@@ -10,8 +10,10 @@ class Migration_add_userid_to_hardware extends CI_Migration {
 			'user_id BIGINT(20) DEFAULT NULL',
 		);
 
+		if (!$this->db->field_exists('user_id', 'cat')) {
 			$this->dbforge->add_column('cat', $fields);
 		}
+	}
 
 	public function down()
 	{