Fix bug when cannot set a config value to empty string #3018
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Summary
Currently
$ yarn config set <config_key> ""
sets the respective config value to true. It should be possible to set config values to an empty string.Omitting config value should still default to true, e.g.
$ yarn config set strict-ssl
should set strict-ssl config value to true.
Test plan
$ yarn config set version-tag-prefix ""
should set version-tag-prefix config value to an empty string.