Conditional tag ignore suffix logic (empty() always false)

[rafageist]

From PHPStan baseline: src/div.php lines 1977-2005.

Issues:

• empty(DIV_TAG_CONDITIONAL_*_SUFFIX) is always false/true per PHPStan.
• Subsequent === false checks on $tag_*_ignore become impossible branches.

Snippet:
= empty(DIV_TAG_CONDITIONAL_TRUE_BEGIN_SUFFIX) ? DIV_TAG_CONDITIONAL_TRUE_BEGIN_PREFIX . . DIV_TAG_VAR_MEMBER_DELIMITER : false; = empty(DIV_TAG_CONDITIONAL_TRUE_END_SUFFIX) ? DIV_TAG_CONDITIONAL_TRUE_END_PREFIX . . DIV_TAG_VAR_MEMBER_DELIMITER : false; ... if ( !== false) { ... }

Action: confirm whether these DIV_TAG_* suffixes can be empty; if not, simplify/remove the dead branches or adjust to a runtime-configured value.