Fix batch delete with operands

[tsmith023]

This PR resolves the bug raised in #477 where the operands key was not being checked appropriately during batch delete operations

[codecov-commenter]

Codecov Report

Patch coverage: 91.83% and project coverage change: -0.55% ⚠️

Comparison is base (eb3bf16) 95.43% compared to head (b5c78ed) 94.88%.
Report is 127 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #479      +/-   ##
==========================================
- Coverage   95.43%   94.88%   -0.55%     
==========================================
  Files          64       72       +8     
  Lines        8165     8608     +443     
==========================================
+ Hits         7792     8168     +376     
- Misses        373      440      +67     

Files Changed	Coverage Δ
weaviate/util.py	90.98% <67.50%> (-5.35%)	⬇️
weaviate/batch/crud_batch.py	77.66% <70.29%> (-17.66%)	⬇️
weaviate/connect/connection.py	89.12% <80.00%> (+0.18%)	⬆️
weaviate/gql/aggregate.py	82.97% <85.45%> (+7.11%)	⬆️
weaviate/schema/crud_schema.py	82.48% <86.20%> (+4.33%)	⬆️
mock_tests/test_exception.py	87.50% <87.50%> (ø)
weaviate/exceptions.py	90.69% <87.50%> (-0.74%)	⬇️
weaviate/gql/filter.py	93.92% <92.92%> (-0.43%)	⬇️
integration/test_schema.py	97.14% <93.87%> (-2.86%)	⬇️
integration/test_batch.py	98.43% <100.00%> (+0.39%)	⬆️
... and 24 more

... and 6 files with indirect coverage changes

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