Errata - SCHLIX CMS v2.1.3 build #3 fix for older PHP 5.5

Since this release (v2.1.3 ~ build #1 and #2) was tested mainly was PHP7 and PHP5.6, apparently there were some stuff that were incompatible with the older version of PHP5.5.

We have fixed this issue and released build #3 for SCHLIX CMS v2.1.3.