WhatsApp inbox responses now return an empty template list when the
stored `message_templates` value is not an array. This prevents mobile
clients from receiving the legacy/default object shape that can crash
the WhatsApp reply box.
Valid template arrays remain unchanged.
Related: https://github.com/chatwoot/chatwoot-mobile-app/pull/1127
### Things to know
- No database migration or backfill is included.
- This does not change the web template-button behavior; that can be
handled separately.
### How to reproduce
1. In a local environment, set a WhatsApp inbox's `message_templates`
value to `{}`.
2. Load the inbox API response and open one of its conversations in the
mobile app.
3. Confirm the response contains `message_templates: []` and the reply
box does not crash.
4. Repeat with a valid template array and confirm the templates are
preserved.
Co-authored-by: Muhsin <12408980+muhsin-k@users.noreply.github.com>
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