Fixed footer slider

【Contents of the fix】
■Fixed a bug that articles with no eye-catching settings are not displayed in the footer slider.
※The order of priority for thumbnail images in the footer slider is as follows: Eye catching image set in each post > Original alternative image for thumbnail 1 (set in TCD theme options “Basic Settings”) > No image image.

The following are the files that have been modified for this update.
【Corrected files】
・footer.php
・style.css