Fix decode part of word_embedding.py to avoid exception

[onting]

embedding file이 손상되서 종료되던 문제를 회피하기 위해서 코드를 수정했습니다.

[codecov-io]

Codecov Report

Merging #32 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master      #32   +/-   ##
=======================================
  Coverage   84.78%   84.78%           
=======================================
  Files         175      175           
  Lines        7757     7757           
  Branches     1001     1001           
=======================================
  Hits         6577     6577           
- Misses        919      920    +1     
+ Partials      261      260    -1

Impacted Files	Coverage Δ
claf/tokens/embedding/word_embedding.py	58.82% <0%> (ø)	⬆️
claf/tokens/vocabulary.py	93.27% <0%> (ø)	⬆️

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