How to get only manual excerpts?

Answering my own question. Solved with an if else statement using has_excerpt.

            if( has_excerpt ( $_post, ID ) ) {
                 $author = sprintf( '<a href="https://wordpress.stackexchange.com/questions/224893/%1$s">Apply</a>', esc_attr( get_the_excerpt( $_post ) ) );
            } else {
                 $author="";
            }

It only makes sense, really.

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