PHP rule for views exposed filter
There might be other more convenient solutions but this is a quick one, in some cases it wont work or suit at all (it will work on pages with clean urls), but you can perform current path validation by this code:

$destination = drupal_get_destination();
$destination = $destination['destination'];

// validate if path contains "?" from exposed filter

if (preg_match("/\?/", $destination)) {
return FALSE;
}
else {
return TRUE;
}