remove a specific category if no category is set in the Event Espresso calendar shortcode

mdeyerinkc_calendar.php

<?php
//* Please do NOT include the opening php tag, except of course if you're starting with a blank file

add_filter(
  'FHEE__EED_Espresso_Calendar__get_calendar_events__query_params',
  'mdeyerinkc_remove_category_calendar_filter',
  10,
  7
);

function mdeyerinkc_remove_category_calendar_filter(
  $query_params,
  $category_id_or_slug,
  $venue_id_or_slug,
  $public_event_stati,
  $start_date,
  $end_date,
  $show_expired
) {
  // is a category set in the shortcode?
  if(is_array($category_id_or_slug )) {
    return $query_params; // yes, get out!
  }
  // still here, so there must be a category to exclude
  // get all cat ids
  $event_category_ids = array();
  // create loop to insert IDs to array
  $event_categories = get_terms( array(
    'taxonomy' => 'espresso_event_categories',
    'hide_empty' => false
) );
foreach( $event_categories as $cat ) {
  if ($cat->term_id != 67) { // exclude this category only!
    $event_category_ids[] = $cat->term_id;
  }
}
  $query_params[0]['OR*category'] = array(
    'Event.Term_Taxonomy.term_id' => array( 'in', $event_category_ids ),
  );
  return $query_params;
}