Avoid an infloop in shr when filling text with :align-to properties

* lisp/net/shr.el (shr-fill-line): Only join together URL buttons
if there are any URL buttons.
1 job for master in 54 minutes and 1 second (queued for 2 seconds)
Status Job ID Name Coverage
  Test
failed #3094
test-all

00:54:01

 
Name Stage Failure
failed
test-all Test
Makefile:318: recipe for target 'check-doit' failed
make[2]: *** [check-doit] Error 1
make[2]: Leaving directory '/builds/emacs/emacs/test'
Makefile:293: recipe for target 'check-expensive' failed
make[1]: *** [check-expensive] Error 2
make: *** [check-expensive] Error 2
make[1]: Leaving directory '/builds/emacs/emacs/test'
Makefile:959: recipe for target 'check-expensive' failed
ERROR: Job failed: exit code 1