This work was produced with the help of language models.

DROP MACRO IF EXISTS on a missing macro throws, while DROP TABLE IF EXISTS and DROP SEQUENCE IF EXISTS return a message. The IF EXISTS message is appended and Catalog::dropMacro then runs anyway:

DROP MACRO IF EXISTS missing_m;     // Catalog exception: Macro missing_m doesn't exist.
DROP TABLE IF EXISTS missing_t;     // Table missing_t does not exist.
DROP SEQUENCE IF EXISTS missing_s;  // Sequence missing_s does not exist.

Expected: Macro missing_m does not exist.
Actual: Catalog exception: Macro missing_m doesn't exist.

Reproduces on 0.21.2 and main (9a23a47).