recover go list return empty

[ca1e]

Describe the PR
ignore empty if there is no go files in dir

Relation issue

Additional context

[codecov]

Codecov Report

Patch coverage: 50.00% and project coverage change: -0.02 ⚠️

Comparison is base (21d34e2) 83.79% compared to head (3817f54) 83.77%.

❗ Current head 3817f54 differs from pull request most recent head 0156ca1. Consider uploading reports for the commit 0156ca1 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1570      +/-   ##
==========================================
- Coverage   83.79%   83.77%   -0.02%     
==========================================
  Files          19       19              
  Lines        3745     3747       +2     
==========================================
+ Hits         3138     3139       +1     
  Misses        520      520              
- Partials       87       88       +1     

Impacted Files	Coverage Δ
parser.go	93.72% <50.00%> (-0.10%)	⬇️

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