Notify user with failing addresses when emailing of results reports #1422
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Description of the issue/feature this PR addresses
Notifies the user with the unsuccessful email addresses when emailing results reports.
Linked issue: #1423
Current behavior before PR
User receives a warning stating "Failed to send Email(s)", but without any further information
Desired behavior after PR is merged
User receives the same warning as above, plus the list of addresses for which the emailing failed
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I confirm I have tested this PR thoroughly and coded it according to PEP8
and Plone's Python styleguide standards.