ENH: small tune ups to "jobs -s" output in case of missing external (datalad)#516

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yarikoptic wants to merge 3 commits intoReproNim:masterfrom

yarikoptic:enh-ext-depends-status

Commits on May 26, 2020

ENH: provide "datalad" module as a name, and why into msg of MissingExternalDependency
yarikoptic
committed
ENH: allow for jobs -s to report NA status whenever needed external is mising
yarikoptic
committed
RF: just catch (and warn) on all exceptions
yarikoptic
committed