qa: correct 903 testcase where no papi counters are available
qa: correct 903 testcase where no papi counters are available

qa/903 - $num_couters variable is not set in cases where there are
no papi counters, not just a value of 0 should be checked.

Signed-off-by: Lukas Berk <2c79189fceb003bb87f26055dc6fdebbd735170d@redhat.com>

andyvand/cygpcpfans,prasincs/pcp,adfernandes/pcp,wuliming/pcp,wuliming/pcp,prasincs/pcp,andyvand/cygpcpfans,aeg-aeg/pcpfans,wuliming/pcp,aeg-aeg/pcpfans,andyvand/cygpcpfans,tjanez/pcp,edwardt/pcp,edwardt/pcp,prasincs/pcp,tjanez/pcp,wuliming/pcp,wuliming/pcp,edwardt/pcp,adfernandes/pcp,aeg-aeg/pcpfans,edwardt/pcp,andyvand/cygpcpfans,prasincs/pcp,prasincs/pcp,andyvand/cygpcpfans,edwardt/pcp,tjanez/pcp,wuliming/pcp,adfernandes/pcp,andyvand/cygpcpfans,tjanez/pcp,adfernandes/pcp,prasincs/pcp,tjanez/pcp,edwardt/pcp,edwardt/pcp,prasincs/pcp,edwardt/pcp,wuliming/pcp,adfernandes/pcp,aeg-aeg/pcpfans,wuliming/pcp,tjanez/pcp,tjanez/pcp,prasincs/pcp,aeg-aeg/pcpfans,andyvand/cygpcpfans,adfernandes/pcp,tjanez/pcp,aeg-aeg/pcpfans,andyvand/cygpcpfans,adfernandes/pcp,aeg-aeg/pcpfans,aeg-aeg/pcpfans,adfernandes/pcp