Fix for importing CVAT image 1.1 data format exported to project level

[vinnamkim]

Signed-off-by: Kim, Vinnam vinnam.kim@intel.com

Summary

• Fix import failure for the dataset which is exported as CVAT for images 1.1 format at project level
• The corresponding bug ticket is https://jira.devtools.intel.com/browse/CVS-100579

How to test

The test case for CVAT for images 1.1 format at project level is added.

Checklist

• I submit my changes into the develop branch
• I have added description of my changes into CHANGELOG
• I have updated the documentation accordingly
• I have added tests to cover my changes
• I have linked related issues

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• I have updated the license header for each file (see an example below)

# Copyright (C) 2021 Intel Corporation
#
# SPDX-License-Identifier: MIT

[codecov-commenter]

Codecov Report

Base: 83.95% // Head: 83.88% // Decreases project coverage by -0.07% ⚠️

Coverage data is based on head (a9d4af6) compared to base (da67b52).
Patch coverage: 81.81% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #795      +/-   ##
===========================================
- Coverage    83.95%   83.88%   -0.07%     
===========================================
  Files          173      173              
  Lines        22779    22746      -33     
  Branches      4951     4936      -15     
===========================================
- Hits         19124    19081      -43     
- Misses        2535     2541       +6     
- Partials      1120     1124       +4     

Flag	Coverage Δ
macos-11_Python-3.10	83.80% <81.81%> (-0.07%)	⬇️
macos-11_Python-3.7	83.49% <81.25%> (-0.07%)	⬇️
macos-11_Python-3.8	83.74% <81.81%> (-0.06%)	⬇️
macos-11_Python-3.9	83.75% <81.81%> (-0.06%)	⬇️
ubuntu-20.04_Python-3.10	83.81% <81.81%> (-0.07%)	⬇️
ubuntu-20.04_Python-3.7	83.49% <81.25%> (-0.07%)	⬇️
ubuntu-20.04_Python-3.8	83.74% <81.81%> (-0.07%)	⬇️
ubuntu-20.04_Python-3.9	83.75% <81.81%> (-0.06%)	⬇️
windows-2019_Python-3.10	83.77% <81.81%> (-0.07%)	⬇️
windows-2019_Python-3.7	83.45% <81.25%> (-0.07%)	⬇️
windows-2019_Python-3.8	83.69% <81.81%> (-0.06%)	⬇️
windows-2019_Python-3.9	83.71% <81.81%> (-0.06%)	⬇️

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

Impacted Files	Coverage Δ
datumaro/plugins/data_formats/cvat/base.py	91.47% <81.81%> (-4.62%)	⬇️
datumaro/plugins/splitter.py	88.47% <0.00%> (-0.23%)	⬇️

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[wonjuleee]

LGTM!