When no sequence file is set, use the default directory as a fake

sequence file.

This change of behavior allows for having a format placeholder while no
sequence file is set and still having the correct directory path.
4 jobs for !453 with kchoi/feat/flexiblematchsearch in 34 minutes and 49 seconds (queued for 70 minutes and 41 seconds)
detached
Status Name Job ID Coverage
  Build
passed build #145854

00:14:26

 
  Test
failed build-and-test-stable #145855

00:14:35

passed build-appimage #145856

00:05:48

 
  Test Unstable
skipped build-and-test-unstable #145857
allowed to fail
 
Name Stage Failure
failed
build-and-test-stable Test
files in cache                      1839
cache size 1.6 GB
max cache size 5.0 GB
Uploading artifacts for failed job
Uploading artifacts...
WARNING: kstars-build/junit_result.stable.xml: no matching files
ERROR: No files to upload
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1