get_the_excerpt() with fallback like the_excerpt()

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The function the_excerpt() is only a echo of the function get_the_excerpt():

function the_excerpt() {
    echo apply_filters('the_excerpt', get_the_excerpt());
}

If you like a fall back for no input the excerpt meta box, then create a text from the content – get_the_content(). You can use the core function wp_trim_words() for set the counter for words and easy to set a text from all content.
A example:

$excerpt = get_the_content();
$excerpt = esc_attr( strip_tags( stripslashes( $excerpt ) ) );
$excerpt = wp_trim_words( $excerpt, $num_words = 55, $more = NULL );

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