`NoMethodError` raised when passing a nil value to `ISBN.valid?`

[ambethia]

private method `delete' called for nil:NilClass
.../isbn-2.0.6/lib/isbn.rb:68:in `valid?'

I would expect it to be returning false instead. I can put together a pull request request with tests as needed for this later.

[tkersey]

Pull request would be great.

Tim Kersey

On Tue, May 3, 2011 at 3:40 PM, ambethia <
reply@reply.github.com>wrote:

private method `delete' called for nil:NilClass
.../isbn-2.0.6/lib/isbn.rb:68:in `valid?'

I would expect it to be returning false instead. I can put together a
pull request request with tests as needed for this later.

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