How to check if CKEditor is loaded on the screen

I am not sure what would be custom code but this is the method I am using in the module.

function atomic_engager_wysiwyg_plugin($editor, $version = 0) {
    switch ($editor) {
        case 'tinymce':
            if (version_compare($version, 3, '>=') && version_compare($version, 4, '<')) {
                return array(
                    'customDictionaryContextMenu' => array(
                        // A URL to the plugin's homepage, optional.
                        'url' => 'http://www.atomicreach.com/',
                        // The full path to the native editor plugin, no trailing slash.
                        // Ignored when 'internal' is set to TRUE below.
                        //'path' => wysiwyg_get_path('tinymce_plugins', TRUE) . '/myplugin',
                        'path' => drupal_get_path('module', 'atomic_engager') . '/inc/customDictionaryContextMenu/editor_plugin.js',
                        // A list of editor extensions provided by this native plugin.
                        // Extensions are not displayed as buttons and touch the editor's
                        // internals, so you should know what you are doing.
                        'extensions' => array(
                            'internal_name_of_myplugin' => t('Atomic Engager Custom Dictionary'),
                        ),
                        // Boolean whether the editor needs to load this plugin. When TRUE,
                        // the editor will automatically load the plugin based on the 'path'
                        // variable provided. If FALSE, the plugin either does not need to
                        // be loaded or is already loaded by something else on the page.
                        // Most plugins should define TRUE here.
                        'load' => TRUE,
                        // Boolean whether this plugin is a native plugin, i.e. shipped with
                        // the editor. Definition must be ommitted for plugins provided by
                        // other modules. TRUE means 'path' and 'filename' above are ignored
                        // and the plugin is instead loaded from the editor's plugin folder.
                        'internal' => FALSE,
                    ),
                );
            }
            break;
        // Below is add to custom dictionary plugi for ckeditor v3.
        case 'ckeditor':
            if (version_compare($version, 3, '>=') && version_compare($version, 4, '<')) {
                return array(
                    'atomicengager' => array(
                        'path' => drupal_get_path('module', 'atomic_engager') . '/inc/ckeditor3/plugin/atomicengager',
                        'buttons' => array(
                            'atomicengager_button' => t('Atomic Engager'),
                        ),
                        'load' => TRUE,
                    ),
                );
            }
            break;
    }
}

Here are the first few lines of the plugin.js file.

(function($) {
    var target;
    if (typeof(CKEDITOR) !== 'undefined') {
    CKEDITOR.plugins.add('atomicengager', {

if(typeof(CKEDITOR)!== 'undefined') seems to fix the issue. However, I am not sure if this is the right way to fix this.

Thanks

Module is not including that file anywhere but from what I shared above. An example would be every admin page when there is no ckeditor on screen. i.e find content page or settings page.

Sorry, I don't understand? Can you provide more info on it.

okay thanks for the explanation. Now if I refer back to your question

"Is Drupal.settings.wysiwyg set when there are no editors?"

so the answer is NO. When there is no editor, it returns 'undefined'.