Improved counter checking to avoid crashes when changing counter nature

fixes Rec#84 (closed)

mentioned in issue Rec#84 (closed)

• [2019-09-19 00:10] Validation started with lhcb-gaudi-head#2390
• [2019-09-19 13:27] Validation started with lhcb-gaudi-head#2391
• [2019-09-20 00:10] Validation started with lhcb-gaudi-head#2392
• [2019-09-21 00:03] Validation started with lhcb-gaudi-head-py3#182
• [2019-09-21 00:04] Validation started with lhcb-sanitizers#377
• [2019-09-21 00:04] Validation started with lhcb-lcg-dev4#1037
• [2019-09-21 00:04] Validation started with lhcb-lcg-dev3#1027
• [2019-09-21 00:05] Validation started with lhcb-test-throughput2#158
• [2019-09-21 00:08] Validation started with lhcb-tdr-test#680
• [2019-09-21 00:10] Validation started with lhcb-head#2373
• [2019-09-21 00:10] Validation started with lhcb-gauss-dev#2145
• [2019-09-21 00:12] Validation started with lhcb-gaudi-head#2393

@sponce this breaks all the tests. Look e.g. at https://lhcb-nightlies.cern.ch/logs/tests/nightly/lhcb-gaudi-head/2390/x86_64-centos7-gcc8-opt/LHCb/

removed 1 deleted label

added 1 deleted label

unmarked as a Work In Progress

resolved all threads

removed 1 deleted label

merged

mentioned in commit e32b2249