Massimiliano Culpo 59b6822a47 Creating versions from urls doesn't modify class attributes (#15452) ... fixes #15449 Before this PR a call to pkg.url_for_version was modifying class attributes determining different results for subsequents calls and an error when the urls was empty.		2020-03-12 09:21:19 +01:00
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spack	Creating versions from urls doesn't modify class attributes (#15452)	2020-03-12 09:21:19 +01:00