Fix missing "Send to OptionTree" button in Custom Post Types with no "editor"

Hey there,

<a href="http://codex.wordpress.org/Function_Reference/register_post_type">Registering a custom post type</a> with no support for the editor (see <a href="http://codex.wordpress.org/Function_Reference/add_post_type_support#Parameters">post_type_support</a>) will cause the _"Send to OptionTree"_ button (originally _"Insert into Post"_) to be missing from the Media Library tab (in the Media Upload iframe):

<img src="https://public-maddim.s3.amazonaws.com/misc/Send%20to%20OptionTree%20Missing%20Button.png" />

I've encountered this issue with OptionTree when using the "Upload" option type in a metabox.

This fixes it by adding the button if it is missing.
Cheers!
JoNa