Qt Metrics v2.3.1: Fix to a timescale selection case

If project don't have any builds since a selected filter date,
the all data part in autotest dashboard is empty and therefore
should not be checked. In such a case all project builds were
checked. Parameter initialization corrected.

Change-Id: I8cfc29aedbc535d87d5c01372cc2ab0a29708c82
Reviewed-by: Tony Sarajärvi <tony.sarajarvi@digia.com>