Infrastructure: Python incorrect test summary

[cv3d]

Builders indicate that Python have passed 0 tests, which is not correct.
Here is an example build

Actual summary

test_python2 test_python2 ; passed: 0 ; 
test_python3 test_python3 ; passed: 0 ; 

Expected summary

test_python2 test_python2 ; cases (tests): 64 (53) ; passed: 53 ; skipped: 11 ; 
test_python3 test_python3 ; cases (tests): 64 (53) ; passed: 53 ; skipped: 11 ;