BUG Report: wpt_field_options $title is empty when SELECT field for Term Field

We do not have official Documents and information about the filter wpt_field_options but we work on this.

The filter wpt_field_options can be used to manipulate the options of select and radio field.

Arguments:
$current_options
$title (the title of the field)

Output:
Array

Required format:

array(
    array(
        '#title' => 'First Title',
        '#value' => 'first-value'
    ),
    array(
        '#title' => 'Second Title',
        '#value' => 'second-value'
    ),
)

Example of usage:
Let’s assume your theme has a colorset of dark, light and accent color, which are editable in the theme options. The theme stores these values as a wp_option theme_name_colorset in this format:

array(
    'Dark'         => '#333333',
    'Light'        => '#eeeeee',
    'Accent Color' => '#ff3300'
)  

You want to use these colors on a custom select field to define the headline color of the post. So we create a post field group with a select field:
https://drive.google.com/file/d/0B-e4FFHtzndlU1dfaXZtMFJlV2c/view?usp=sharing

Now we adding this function to our themes functions.php:

add_filter( 'wpt_field_options', function ( $current_options, $title_of_field ) {
    if ( $title_of_field != 'Headline Color' ) {
        // not our "Headline Color" field
        return $current_options;
    }

    $theme_colorset = get_option( 'theme_name_colorset' );

    if ( ! $theme_colorset ) {
        // no theme colors are set yet
        return array(
            array(
                '#title' => 'No colors available',
                '#value' => 0
            )
        );
    }

    $new_options = array();
    foreach ( $theme_colorset as $color_title => $color_value ) {
        $new_options[] = array(
            '#title' => $color_title . ' (' . $color_value . ')',
            '#value' => $color_value
        );
    }

    return $new_options;
}, 10, 2 );

This is the result:

https://drive.google.com/open?id=0B-e4FFHtzndlenRNVVowNW44RFk
https://drive.google.com/open?id=0B-e4FFHtzndlaE83blNKeVRKSWc

I cannot assist Custom Code further, but this should give you enough informations to work with it.
Soon we will publish a DOC about it as well.

Just an update for anyone who is facing similar problem where $title variable may be coming as null/empty, add this code block in the beginning of the function –

add_filter( 'wpt_field_options', 'custom_select_options', 10, 3);

function custom_select_options( $old_options, $title, $type ) {
	if (empty($title) || $title=='') {
		$wptoolset_field = $GLOBALS['wptoolset_field'];
		$title = str_ireplace('wpcf-','', $wptoolset_field->getId());
	}
	
	// more code
}

@ayandebnath Thank you, sir. You saved my day.

@ayandebnath Thank you!!! You saved my day also.