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can't dup NilClass #98
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jyurek
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Feb 2, 2018
`Terrapin::CommandLine.new` had a defualt 2nd and 3rd argument of "" and {},
respectively. But if you explicitly pass in `nil`, then you'll get an error
because `#dup` isn't on `nil`. It's not immediately appareny why you get this
error, so this change makes it so that we tell you.
Fixes thoughtbot/cocaine#98
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I get
TypeError: can't dup NilClasswhen doingCocaine::CommandLine.new('some command', nil).runCould we have an error message that's more descriptive like a Cocaine error that says "nil is not a valid argument"?
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