Sed small reminder (in Russian)

Today I was forced to export LDIF output to CSV file.

Too sad, I haven`t used my regex/sed skills for a while, so a lot was forgotten.
Nevertheless - I managed to make from this

Maxim Kavalera
mkavalera@google.com

to

mkavalera@google.com, Maxim Kavalera

with this:
sed -e '/^$/d' -e '$!N;s/\n/\, /' input_file > output_file

Regexp is Black Magic, truly...

Also - small reminder for Sed, in Russian. Thank you, SudoUser