Glenn Johnson 4f09e8c975 Only use list if list_url set ... This commit will make urls from list_url only checked if `list_url` is set in the package file. This makes more sense as there is no need to check for those if the attribute is not present. If `url` is present and `list_url` is not then it would result in the same url. If `url_for_version` is used then that will not work anyway.		2016-07-23 22:56:08 -05:00
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spack	Only use list if list_url set	2016-07-23 22:56:08 -05:00