fix(print-enum-json): 修复const为空的报错

[nameliuqi]

No description provided.

[codecov]

Codecov Report

Merging #19 into master will decrease coverage by 0.09%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master      #19     +/-   ##
=========================================
- Coverage   86.69%   86.59%   -0.1%     
=========================================
  Files          13       13             
  Lines        1097     1097             
  Branches       98       99      +1     
=========================================
- Hits          951      950      -1     
  Misses        122      122             
- Partials       24       25      +1

Impacted Files	Coverage Δ
src/thriftNew/print.ts	89.85% <0%> (-0.73%)	⬇️

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