fix list value not unpacked

[wongoo]

What this PR does:
fix list value not unpacked

Which issue(s) this PR fixes:
Fixes #299

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

- fix list value not unpacked. #299

[codecov-commenter]

Codecov Report

Merging #300 (cc52001) into master (c715349) will decrease coverage by 0.00%.
The diff coverage is 73.33%.

@@            Coverage Diff             @@
##           master     #300      +/-   ##
==========================================
- Coverage   70.70%   70.69%   -0.01%     
==========================================
  Files          27       27              
  Lines        3021     3027       +6     
==========================================
+ Hits         2136     2140       +4     
- Misses        660      661       +1     
- Partials      225      226       +1     

Impacted Files	Coverage Δ
codec.go	74.67% <69.23%> (-0.90%)	⬇️
java_collection.go	60.56% <100.00%> (+1.65%)	⬆️
list.go	85.52% <100.00%> (ø)

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