fuse.py update doctest

Changes to concatenate_with_padding mean this one test needs to change
as well.
See #3154
6 jobs for feature-s/3154-pre_process_json in 7 minutes and 40 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test Tools
passed #681472
test_tools

00:00:10

 
  Test Unit
passed #681473
web
test_server_unit

00:00:22

 
  Deploy Review
manual #681474
allowed to fail manual
deploy_review_server
manual #681475
allowed to fail manual
stop_deploy_review_server
 
  Test Functional
passed #681476
docker x86_64
ff32-server-functional

00:05:43

passed #681477
docker x86_64
ff45-server-functional

00:07:07