Fix existing 'versions' not empty in the sandbox panel

When 'versions' is empty, the « From an existing version » option in
the template is hidden. However reversed() returns an iterator, which
is never False -> need to coerce versions into a list.
1 job for hide-empty-version-sandbox-panel in 1 minute and 25 seconds (queued for 6 minutes and 54 seconds)
Name Stage Failure
failed
bootstrap Build
+ wait
+ docker-compose up -d dev-mysql
Creating dev-mysql ...
Creating dev-mysql ...
error
ERROR: for dev-mysql Cannot start service dev-mysql: driver failed programming external connectivity on endpoint dev-mysql (9634bda13c0dc4d06d8a4d0666cc1c6b8ec20d3bd85455bf44d62ecd5423372c): Error starting userland proxy: listen tcp 0.0.0.0:3306: bind: address already in use

ERROR: for dev-mysql Cannot start service dev-mysql: driver failed programming external connectivity on endpoint dev-mysql (9634bda13c0dc4d06d8a4d0666cc1c6b8ec20d3bd85455bf44d62ecd5423372c): Error starting userland proxy: listen tcp 0.0.0.0:3306: bind: address already in use
Encountered errors while bringing up the project.
ERROR: Job failed: exit code 1