Gregor Jasny ea6475334a Do not report ALIASED_TARGET as always set (#15783) ...

The cmGetPropertyCommand::StoreResult expects NULL for unset
properties. Make ALIASED_TARGET align with that expectation.

Additional corrections to the unit tests are necessary because
get_property removes variables for unset properties (in contrast
to get_target_property which stores a -NOTFOUND value).

2016-07-16 11:09:18 -07:00

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