Joachim Fasting 4c41c412a0
nix gc service: fix use of startAt
`startAt = ""` as in `startAt = optionalString false ...` results
in an invalid timer unit (due to "" being promoted to a singleton
list and not filtered out).

Ref: c9941c4b5ef7acc1cb8d734acb383410d99c01ba
2016-10-23 17:56:49 +02:00
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