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Slack rejects a rich_text_section / rich_text_preformatted / rich_text_quote
whose elements list is empty or contains a zero-length text element, and a
header whose plain_text is empty. The Block Kit renderer emits exactly those
shapes for common inputs: a markdown table with a blank cell or a ragged
(short) row, an empty fenced code block, a blank quote line, an empty list
item, and an emphasis-only header ("# ***"). Any one of them poisons the
whole payload — chat.postMessage fails with invalid_blocks ("missing element"
/ "must be more than 0 characters") and the message loses its rich rendering
entirely.
Route every rich_text builder's child elements through _nonempty_elements
(drop zero-length text elements; substitute a single space when nothing
remains) and skip headers that reduce to empty after markdown-marker
stripping. Observed in production via live chat.postMessage rejections;
regression tests cover each case plus a well-formed-content control.
Complementary to #56618 (column_settings hardening + no-blocks retry): that
change makes Block Kit rejections recoverable, this one makes the common
empty-content cases render correctly in the first place. No overlapping hunks.
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| __init__.py | ||
| adapter.py | ||
| block_kit.py | ||
| plugin.yaml | ||