(BUG#41127: Maria: assertion when SHOW ENGINE MARIA LOGS and missing logs)

mysql-test/suite/maria/r/maria_showlog_error.result:
  test suite for the BUG#41127
mysql-test/suite/maria/t/maria_showlog_error.test:
  test suite for the BUG#41127
storage/maria/ha_maria.cc:
  Do not use MY_WME in the stat call which errors we process on high level.