No bars for zero-time variables

Should probably add tests for this and the other issue.

added Resource allocation label

assigned to @mikhe33

mentioned in commit 2c6936f5

mentioned in merge request !361 (merged)

mentioned in commit dd44ea5d

mentioned in commit cf1f9cda

mentioned in commit 54b17b9b

mentioned in commit 5580dc74

closed with merge request !361 (merged)