When piping imapcli output, an exception is raised if emails contain …

[codedump]

This will typically fail with imapcli:

$ imapcli search --date 2019-04-01 | less

It will throw an exception, something like this:

Traceback (most recent call last):
  File "/usr/local/bin/imap-cli-search", line 11, in <module>
    sys.exit(main())
  File "/usr/local/lib/python2.7/dist-packages/imap_cli/search.py", line 484, in main
    sys.stdout.write(text)
UnicodeEncodeError: 'ascii' codec can't encode character u'\xa0' in position 5: ordinal not in range(128)

When piping imapcli output, an exception is raised if emails contain non-8-bit
characters. This usually does NOT happen during regular usage with a fairly
smart terminal, only during pipe usage. The reason is that stdout, the
device usually used for output, by default just expects non-encoded 8-bit
character data.

This patch fixes this by explicitly encoding everyting into utf-8 before it
is being written to stdout.

(See also this thread on SO: https://stackoverflow.com/questions/15740236/stdout-encoding-in-python )

Cheers