RFR(s): 8236042: [TESTBUG] serviceability/sa/ClhsdbCDSCore.java fails with -Xcomp -XX:TieredStopAtLevel=1

[Fairoz Matte]

Hi,

Please review this small test change to consider the scenario when there is no 
"printmdo" output

JBS - https://bugs.openjdk.java.net/browse/JDK-8236042 
Webrev - http://cr.openjdk.java.net/~fmatte/8236042/webrev.00/ 

Thanks,
Fairoz