🐛 bugfix: Copy thumbnail only if exists

[odeimaiz]

What do these changes do?

Copy thumbnail only if exists

Bonus

• Ask for checkpoints only if can read

Before:

After:

Related issue/s

How to test

Checklist

[codecov]

Codecov Report

Merging #2548 (a15ee42) into master (4645475) will decrease coverage by 0.0%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master   #2548     +/-   ##
========================================
- Coverage    76.9%   76.8%   -0.1%     
========================================
  Files         619     619             
  Lines       23968   23968             
  Branches     2345    2345             
========================================
- Hits        18437   18427     -10     
- Misses       4908    4915      +7     
- Partials      623     626      +3     

Flag	Coverage Δ
integrationtests	65.4% <ø> (-0.1%)	⬇️
unittests	71.3% <ø> (-0.1%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
..._director_v2/modules/dynamic_sidecar/client_api.py	80.0% <0.0%> (-5.6%)	⬇️
...tor_v2/modules/dynamic_sidecar/scheduler/events.py	93.6% <0.0%> (-3.8%)	⬇️
...rector_v2/modules/comp_scheduler/base_scheduler.py	90.7% <0.0%> (-2.2%)	⬇️
...webserver/computation_comp_tasks_listening_task.py	83.6% <0.0%> (-2.1%)	⬇️
.../director/src/simcore_service_director/producer.py	61.4% <0.0%> (+0.2%)	⬆️
...simcore_service_director_v2/modules/dask_client.py	92.5% <0.0%> (+1.6%)	⬆️

[KZzizzle]

Awesome thanks for the quick fix!

[pcrespov]

Good!
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