Only display on sidebar if only got value inserted on post

Question

Try using this:

// Get the 'WpForest_soft' custom field value.
$text = get_post_meta( $post->ID, 'WpForest_soft', true );

// Print the value and surrounding markup only if the value tests true.
if ( $text )
    printf( '<tr><td class="attr-name">%s</td><td class="attr-detail">%s</td></tr>', __( 'Software Version', 'WpForest' ), $text );

General Case

To do the above with any optional markup follow these steps.

1) Place the custom field value of in a variable. Use a relevant variable name.

// Get the 'WpForest_soft' custom field value.
$wpforest_soft = get_post_meta( $post->ID, 'WpForest_soft', true );

2) Write a PHP conditional testing the value from step 1.

if ( $wpforest_soft ) {
}

3) Add your markup to that conditonal.

if ( $wpforest_soft ) {
    ?>
    <a href="https://wordpress.stackexchange.com/questions/98389/<?php bloginfo("url'); ?>/theme-demo/<?php echo the_ID(); ?>" class="blue-btn right ml10 live-preview" target="_blank">Live Preview</a>
    <a href="https://wordpress.stackexchange.com/questions/98389/<?php bloginfo("url'); ?>/theme-demo/<?php echo the_ID(); ?>" class="blue-btn right ml10 live-preview" target="_blank">Video Preview</a>
    <a href="https://wordpress.stackexchange.com/questions/98389/<?php bloginfo("url'); ?>/screenshots/<?php echo the_ID(); ?>" class="blue-btn right ml10 screenshots" target="_blank">Screenshots</a>
    <?php
}

4) (Optional) Avoid jumping in and out of PHP and Markup. The printf() PHP function can help.

if ( $wpforest_soft ) {
    printf(
        '<a href="https://wordpress.stackexchange.com/questions/98389/%1$s/theme-demo/%2$s" class="%3$s" target="_blank">Live Preview</a>' .
        '<a href="https://wordpress.stackexchange.com/questions/98389/%1$s/theme-demo/%2$s" class="%3$s" target="_blank">Video Preview</a>' .
        '<a href="%1$s/screenshots/%2$s" class="%4$s" target="_blank">Screenshots</a>',

        get_bloginfo( 'url' ),
        get_the_ID(),
        'blue-btn right ml10 live-preview',
        'blue-btn right ml10 screenshots'
    );
}

Or just:

if ( $wpforest_soft )

    printf(
        '<a href="https://wordpress.stackexchange.com/questions/98389/%1$s/theme-demo/%2$s" class="%3$s" target="_blank">Live Preview</a>' .
        '<a href="https://wordpress.stackexchange.com/questions/98389/%1$s/theme-demo/%2$s" class="%3$s" target="_blank">Video Preview</a>' .
        '<a href="%1$s/screenshots/%2$s" class="%4$s" target="_blank">Screenshots</a>',

        get_bloginfo( 'url' ),
        get_the_ID(),
        'blue-btn right ml10 live-preview',
        'blue-btn right ml10 screenshots'
    );

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