fix: Fix a bug that bulkimport cannot handle empty struct list

[yhmo]

issue: https://github.com/milvus-io/milvus/issues/42148

[mergify[bot]]

@yhmo

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[codecov[bot]]

Codecov Report

:x: Patch coverage is 57.89474% with 8 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 76.48%. Comparing base (aa0870d) to head (d4bdc8f). :warning: Report is 36 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/util/importutilv2/csv/row_parser.go	0.00%	3 Missing and 1 partial :warning:
internal/util/importutilv2/json/row_parser.go	69.23%	3 Missing and 1 partial :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #45693       +/-   ##
===========================================
- Coverage   83.19%   76.48%    -6.71%     
===========================================
  Files         521     1875     +1354     
  Lines       81430   292666   +211236     
===========================================
+ Hits        67744   223858   +156114     
- Misses      13686    61368    +47682     
- Partials        0     7440     +7440     

Components	Coverage Δ
Client	78.17% <ø> (∅)
Core	83.19% <93.75%> (+<0.01%)	:arrow_up:
Go	74.59% <69.59%> (∅)

Files with missing lines	Coverage Δ
...l/util/importutilv2/parquet/struct_field_reader.go	45.94% <100.00%> (ø)
internal/util/importutilv2/csv/row_parser.go	75.60% <0.00%> (ø)
internal/util/importutilv2/json/row_parser.go	81.29% <69.23%> (ø)

... and 1354 files with indirect coverage changes

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[mergify[bot]]

@yhmo go-sdk check failed, comment rerun go-sdk can trigger the job again.

[mergify[bot]]

@yhmo cpu-e2e job failed, comment /run-cpu-e2e can trigger the job again.

[yhmo]

rerun go-sdk

[yhmo]

/run-cpu-e2e

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[mergify[bot]]

@yhmo go-sdk check failed, comment rerun go-sdk can trigger the job again.

[yhmo]

/ci-rerun-ut-integration

[yhmo]

/ci-rerun-ut-integration

[SpadeA-Tang]

/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: congqixia, yhmo

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