Fixed multiple bugs

【Contents of the fix】
■Fixed a widget error that occurs in PHP7.
■Fixed a bug that occurs when customizing functions.php and disabling the multi-posters feature.

The files that have been modified for this update are as follows
【Corrected files】
widget/ad.php
widget/archive_list.php
widget/category_list.php
widget/google_search.php
widget/popular_post_list.php
widget/popular_post_list2.php
widget/styled_post_list1.php
widget/styled_post_list2.php
single.php
style.css

For more information, please visit the IZM(tcd034) download site for purchasers.

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