v1.7.1

Fixed

• deprecated-tags.php: related_post_content migration entry had new_tag => 'title'; corrected to 'content'. Callback was already correct; only the migration hint was wrong.
• includes/hooks.php (new): GB's required check uses ! $replacement (falsy, not empty-string), silently killing blocks for two legitimate cases: as:alt with no alt text (empty string), and text fields returning '0' (e.g. jersey number zero). Filter on generateblocks_dynamic_tag_replacement — the only hook between callback return and the required check — returns ' ' for empty alt and '0 ' for bare zero. Both render correctly in HTML; trailing space collapses in text content, space is semantically equivalent to empty alt.
• bws_read_field(): in GB query loops, Mode 2a (row_post_id) and Mode 2b (loop_item) branches read from the row entity even when caller passed an explicit $post_id. Broke any meta-field tag (try_text use:key, try_content use:key, try_image use:key, base text, content, image custom-field paths) whose src:ref slot resolved a post outside the loop row — the resolved id was ignored and the loop row was read instead, yielding empty results when the row entity lacked the field. Explicit $post_id (from upstream resolution like bws_resolve_post_by_source) now always wins; loop branches only fire when no explicit id was passed.