only throw warning if perl locale is missing

[firstdorsal]

i am using your tool with electron and it terminates with the error:

perl: warning: Please check that your locale settings:
	LANGUAGE = (unset),
	LC_ALL = "en-US",
	LANG = "en_US.UTF-8"
    are supported and installed on your system.
perl: warning: Falling back to a fallback locale ("en_US.UTF-8").

using it without electron doesn't throw an error on the same system.
this logs the error as warning but won't exit.

[claytonrothschild]

What causes this perl locale error in the first place? Can anybody point me in the right direction?

Here is my error:

Error: Unexpected string on start: perl: warning: Setting locale failed.
  perl: warning: Please check that your locale settings:
  	LANGUAGE = (unset),
  	LC_ALL = (unset),
  	LC_TERMINAL = "iTerm2",
  	LC_TERMINAL_VERSION = "3.4.12",
  	LC_CTYPE = "UTF-8",
  	LANG = "en_US.UTF-8"
      are supported and installed on your system.
  perl: warning: Falling back to a fallback locale ("en_US.UTF-8").