If You host your own WP blog, and want your images link to be cleared out by default; follow these steps.
Log in to your blog. Then add this to the end of your URL. /wp-admin/options.php
Example: yourblogsname.com/wp-admin/options.php
The root admin options will be displayed. Be very careful editing values, I am not responsible if you mess something up.
Scroll down to “image_default_link_type”
Change the value from “file” to a blank. Just clear it all out…
Scroll to the bottom and click save. Thats it. Now every time you upload an image, the link will not be preset, and clear.
Have a good day, 🙂