Greg Becker 8a17282001 Fix reading externals from old databases (#11118) ... * Update Spec.prefix to have special case for 'None' in database path; regression test * Update in database reader rather than spec * Change assertion to conditional + raise * Added test for concrete check in Spec.prefix		2019-04-05 14:58:57 -07:00
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spack	Fix reading externals from old databases (#11118)	2019-04-05 14:58:57 -07:00