Value of url($fragment) is reset after being set to null (or equivalent) in webform additional processing.

line 33 of webformblock.module:

$form['#action'] = url(drupal_get_path_alias($_GET['q']), array('fragment' => $anchorname));

If $fragment is assigned a value in webform's additional processing field, that value is passed to the final #anchor output, which is great. But, if you try to set the value of $fragment as null, '', or unset() it, then webformblock resets it to $anchorname. This causes problems when submitting the webform to an external location that does not need the #anchorname appended to the URL.

Two solutions:

Ideal: respect the value of $fragment set in webforms additional processing, even if it is empty or null.

Other: perform a check to see if the target URL is internal or external, and append the #anchor accordingly. I dont know how many external form submissions take advantage of the #anchor so I am not sure what kind of problems omitting it for all external submissions would cause...