ltchiptool 4.14.0 breaks ESPHome compilation

[ericyanush]

Tested against ESPHome 2026.2.0, 2026.2.4, 2026.3.2, all in the official ESPHome docker container.

In all cases, compiling for a target of generic-rtl8720cf-2mb-992k or generic-rtl8720cm-4mb-1712k results in an error after linking:

|   |-- image_flash_is.0x000000.bin
|-- TypeError: Type of 'if_not=' (<class 'NoneType'>) different than the field type; while initializing 'ota_signature'
|   |-- File "/root/.platformio/penv/.libretiny/lib/python3.12/site-packages/datastruct/utils/validation.py", line 199, in _validate_cond

Forcibly downgrading the ltchiptool to v4.13.0 in the .libretiny venv fixes the issue.

[kuba2k2]

Fixed in v4.14.1.
To update, try clearing PlatformIO caches and/or recreate the ESPHome container/reinstall the add-on.