empty lines in outputdict with --remove-puncuation

[rixvet]

What?
While demeuking a file with --remove-punctuation with lines which contains all punctuation the resulting dictionary lines contains multiple blanks lines,

Reproduction?

$cat <<EOF > foo.dict
first-password
-
-+
-+-
-+-+
-+-+-
-+-+-+
-+-+-+-
-+-+-+-+
-+-+-+-+-
-+-+-+-+-+
-+-+-+-+-+-
-+-+-+-+-+-+
-+-+-+-+-+-+-
example
foobar
EOF

$ python3 demeuk.py -i foo.dict -o bar.dict --remove-punctuation

 uniq -c bar.dict
      1 firstpassword
     13
      1 example
      1 foobar

Expects?
Empty lines (or duplicated entries) to be removed from results.