fix: hide debug warning if typescript is not found

[jdx]

Fixes #73

[codecov]

Codecov Report

Merging #75 into master will increase coverage by 0.16%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #75      +/-   ##
==========================================
+ Coverage   68.53%   68.69%   +0.16%     
==========================================
  Files           7        7              
  Lines         429      428       -1     
  Branches      120      120              
==========================================
  Hits          294      294              
+ Misses         86       85       -1     
  Partials       49       49

Impacted Files	Coverage Δ
src/ts-node.ts	84.31% <100%> (+1.62%)	⬆️

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[codecov]

Codecov Report

Merging #75 into master will increase coverage by 0.16%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #75      +/-   ##
==========================================
+ Coverage   68.53%   68.69%   +0.16%     
==========================================
  Files           7        7              
  Lines         429      428       -1     
  Branches      120      120              
==========================================
  Hits          294      294              
+ Misses         86       85       -1     
  Partials       49       49

Impacted Files	Coverage Δ
src/ts-node.ts	84.31% <100%> (+1.62%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 4607c80...feae7b2. Read the comment docs.