Buffer zero size alloc

[mcakircali]

In eckit::Buffer default ctor (size=0), buffer_ is allocated as 'new char[0]'.

'buffer.data() != nullptr', which is not a correct state for an uninitialized buffer

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.72%. Comparing base (8d230b1) to head (3d6e286).
Report is 8 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #137      +/-   ##
===========================================
- Coverage    63.80%   63.72%   -0.08%     
===========================================
  Files         1069     1065       -4     
  Lines        55387    55156     -231     
  Branches      4100     4084      -16     
===========================================
- Hits         35337    35149     -188     
+ Misses       20050    20007      -43     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[github-actions]

Private downstream CI failed.
Workflow name: private-downstream-ci-hpc
View the logs at https://github.com/ecmwf-actions/private-downstream-ci/actions/runs/9845331440.

[github-actions]

Private downstream CI failed.
Workflow name: private-downstream-ci
View the logs at https://github.com/ecmwf-actions/private-downstream-ci/actions/runs/9845621725.

[wdeconinck]

Looks uncontroversial to me :)

[github-actions]

Private downstream CI failed.
Workflow name: private-downstream-ci-hpc
View the logs at https://github.com/ecmwf-actions/private-downstream-ci/actions/runs/10706093266.

[github-actions]

Private downstream CI succeeded.
Workflow name: private-downstream-ci
View the logs at https://github.com/ecmwf-actions/private-downstream-ci/actions/runs/10706238996.

[github-actions]

Private downstream CI succeeded.
Workflow name: private-downstream-ci
View the logs at https://github.com/ecmwf-actions/private-downstream-ci/actions/runs/10706238996.

[github-actions]

Private downstream CI succeeded.
Workflow name: private-downstream-ci
View the logs at https://github.com/ecmwf-actions/private-downstream-ci/actions/runs/10706238996.