fix(firestore-send-email): kit/extension parity – templates without data render with {} instead of undefined #3301

firestore-send-email kit/extension parity. Priority: low. A template rendered with no data gives different output.

Difference

• Extension: passes template.data as-is, so undefined when it's missing.
• Kit: passes template.data || {}. Handlebars then treats the context as truthy and prints it.

Reproduced

Template html IF:{{#if this}}Y{{else}}N{{/if}} THIS:[{{this}}] sent with no data:

• Extension: IF:N THIS:[]
• Kit: IF:Y THIS:[[object Object]]

Strict-mode attachment errors also change from "not defined in undefined" to "not defined in [object Object]".

Code

• Extension: prepare-payload.ts#L41
• Kit: prepare-payload.ts#L50-L53

Resolution

Pass payload.template.data unchanged.