[FIX] mass_mailing: make recipients unique by email #604
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This commit makes the recipients of any mass.mailing res_model unique by email. The email can be read from either the email field or the partner_id.email field, if they exist, otherwise the behavior is as usual.
The partner_id case requires a further loop of deduplication because partner_id.email is not stored in sale.order and read_group does not allow fetching indirect fields.
Related: https://gitlab.com/ircanada/ircodoo/-/issues/2849
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