dropTable() not working when no database prefix set.

Hi, 
When I roll out migration ,the following error appears:

D:\xampp\htdocs\ci4.dev\pms>php spark migrate:rollback

CodeIgniter CLI Tool - Version 4.0-dev - Server-Time: 2017-09-25 20:22:32pm

Rolling back all migrations...

strpos(): Empty needle
D:\xampp\htdocs\ci4.dev\pms\system\Database\Forge.php - 492

Done

my migration code is

PHP Code:

<?php namespace App\Database\Migrations;

use CodeIgniter\Database\Migration;

class Migration_Add_project_table extends Migration
{
    

    public function up()
    {
        
        $this->forge->addField([
            'blog_id'          => [
                'type'           => 'INT',
                'constraint'     => 5,
                'unsigned'       => true,
                'auto_increment' => true,
            ],
            'blog_title'       => [
                'type'       => 'VARCHAR',
                'constraint' => '100',
            ],
            'blog_description' => [
                'type' => 'TEXT',
                'null' => true,
            ],
        ]);
                $this->forge->addKey('blog_id', true);
                $this->forge->createTable('blog');
    }
    public function down()
    {
         $this->forge->dropTable('blog');
    }
} 


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It was big and fixed. https://github.com/bcit-ci/CodeIgniter4/pull/736

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