Fix handling of metric in _OpSum

9 jobs for opsumdomains in 9 minutes and 26 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build Docker
passed #761524
build_docker_from_cache

00:00:23

 
  Test
passed #761526
test_mpi

00:04:48

passed #761525
test_serial

00:05:25

80.0%
 
  Demo Runs
passed #761531
run_bernoulli

00:00:48

passed #761532
run_curve_fitting

00:00:43

passed #761528
run_getting_started_1

00:00:51

passed #761529
run_getting_started_2

00:01:41

passed #761530
run_getting_started_3

00:03:36

passed #761527
run_ipynb

00:01:54