[#1737] Fix test timer for skipped tests.


Problem description
===================

For tests the are skipped during setup time the inner time is huge... it is in fact the current timestamp.


Changes description
===================

Set time to 0 for test for which inner start time was not initiated.  Ex test that were skipped during setup.


How to try and test the changes
===============================

reviewers @alibotean 

Check that everything is on.

Run

paver test test_testcase:TestEmpiricalTestCaseSkipSetup --with-timer

the inner time (first value) should be zero.