ma-chat: Don't warn if room name not found

It's common and valid to not have name for a room,
So don't warn in that cases
7 jobs for wip/sadiq/matrix-fixes in 8 minutes and 30 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #373115
librem5
build-pureos-gcc-byzantium

00:01:48

 
  Test
passed #373117
librem5
check-po

00:00:19

passed #373116
librem5
test:debian-gcc

00:01:36

21.1%
 
  Package
passed #373118
librem5
package-pureos-byzantium

00:01:41

passed #373119
librem5:arm64
package-pureos-byzantium:arm64

00:05:05

 
  Test Package
passed #373120
librem5
autopkgtest-pureos-byzantium-package

00:01:26

passed #373121
librem5
lintian-pureos-byzantium-package

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