Don't use the IDN traslated name if no conversion took a place

(cherry picked from commit 08f66d85)
7 jobs for 26-fix-normalization-for-non-IDN-v9_11 in 8 minutes and 57 seconds (queued for 6 seconds)
Status Job ID Name Coverage
  Precheck
passed #5822
linux docker
precheck:debian:sid:amd64

00:00:12

 
  Build
passed #5823
linux docker
build:debian:sid:amd64

00:03:13

passed #5824
linux docker
build:debian:sid:i386

00:03:32

 
  Test
passed #5827
linux docker
systemtest:debian:sid:amd64

00:04:26

passed #5828
linux docker
systemtest:debian:sid:i386

00:04:39

passed #5825
linux docker
unittest:debian:sid:amd64

00:00:55

passed #5826
linux docker
unittest:debian:sid:i386

00:00:52