Views plugin exposed form throws a 'Theme not found' error when the view is rendered programmatically

Problem/Motivation

When rendering a view with an exposed form programmatically, no #theme value is set when the system attempts to render a view with an exposed form. In this case, the views data is rendered out to csv.

Steps to reproduce

Render a view with an exposed form programmatically and note "Theme hook not found" error in dblog.

Proposed resolution

Slightly alter the code in views_plugin_exposed_form.inc to set the form's '#theme' value to an array containing a blank key if it is not present to prevent the generation of the "Theme hook not found" error.