Render an email template
Render an email template for the given lead/contact using the current user context.
Accepts two forms of usage:
- Single lead/contact:
- `lead_id` and `contact_id` is supplied (both required)
- Preview results from a search query
- `query` (required) contains a search query
- `entry` (optional, ranges from 0 to 99) specifies the index of the lead/contact that should be rendered.
- `mode` (optional), which can have a value of:
- `lead` (default), the first contact of the lead with the index given by `entry` will be rendered (excluding leads that have no email addresses).
- `contact`, then `entry` refers to the index of the contact (excluding contacts that have no emails). Will return an empty dict if there are no more entries.