email: don't crash on sending mails with unicode comments without appropriate environment configuration (Issue #275) For example, on Linux, running `gearbox serve` with LANG=C, would crash in: File ".../kallithea/lib/celerylib/tasks.py", line 307, in send_email % (' '.join(recipients), headers, subject, body, html_body)) UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 224: ordinal not in range(128) Replacing render with render_unicode works in this case ... but there might be other problems elsewhere.