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buffer: fix Buffer.isEncoding() return value for empty string

Rodrigo Muino Tomonari requested to merge github/fork/DavidCai1111/buffer/is-encoding-empty-string into master

For now the return value of Buffer.isEncoding('') is true which seems not the preferred behavior:

> Buffer.isEncoding('')
true

This PR is to fix this.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines
Affected core subsystem(s)

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