scheibelp 0038ea84a1 Avoid null reference in arch concretization (#2596) ... Fixes #2587 The concretizer falls back on using the root architecture (followed by the default system architecture) to fill in unspecified arch properties for a spec. It failed to check cases where the root could be None.		2017-04-04 15:03:52 -07:00
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spack	Avoid null reference in arch concretization (#2596)	2017-04-04 15:03:52 -07:00