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_12 in 9 minutes (queued for 5 seconds)
Status Job ID Name Coverage
  Precheck
passed precheck:debian:sid:amd64 #5815
docker linux

00:00:10

 
  Build
passed build:debian:sid:amd64 #5816
docker linux

00:03:16

passed build:debian:sid:i386 #5817
docker linux

00:03:36

 
  Test
passed systemtest:debian:sid:amd64 #5820
docker linux

00:04:59

passed systemtest:debian:sid:i386 #5821
docker linux

00:05:11

passed unittest:debian:sid:amd64 #5818
docker linux

00:00:49

passed unittest:debian:sid:i386 #5819
docker linux

00:00:50