remove 'xyz is already created' warning in ProblemStat::initialize

4 jobs for issue/remove_warning_problemstat in 61 minutes and 42 seconds (queued for 46 minutes and 56 seconds)
Status Job ID Name Coverage
  Test
passed #20988
dune-2.6

00:24:02

passed #20989
dune-2.7

00:31:47

passed #20990
dune-git

00:31:43

passed #20991
dune-git-full

00:44:33