[harsh-thakkar7]

Que tipo de Pull Request es?

• Mejoras
• Bug
• Docs / tests

Descripción

Refs #1255 (the remaining empty-array-entry case).

The existing guard rejects addKeyword('') and addKeyword([]), but an empty string inside a non-empty array still passes. FlowClass turns that entry into an empty regular expression, allowing unrelated incoming messages to match the flow.

Changes

• Reject empty strings anywhere in the keyword array with the existing KEYWORD_CANNOT_BE_EMPTY error.
• Add regression coverage for both [''] and ['hola', ''].
• Preserve existing behavior for valid keywords and the existing error contract.

Verification

• The new regression failed before the production change because no error was thrown.
• Targeted UVU tests: 16/16 passed.
• pnpm test: all 29 monorepo test projects passed.
• pnpm --filter @builderbot/bot build: passed.
• ESLint and Prettier checks for both changed files: passed.

[leifermendez]

Aprobado. La validación evita que una entrada vacía en el array convierta el flujo en un match accidental y conserva el error KEYWORD_CANNOT_BE_EMPTY. Verificación del commit revisado: 16/16 tests de métodos y 209/209 tests del paquete aprobados (1 omitido por la suite), más comparación base/head del matching y compatibilidad de entradas válidas. El rechazo de configuraciones que dependían de keywords vacías es intencional.