Fix batching with empty lists as attributes

[rusty1s]

No description provided.

[codecov]

Codecov Report

Merging #4293 (c5b3a0f) into master (57c88c0) will decrease coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4293      +/-   ##
==========================================
- Coverage   82.82%   82.69%   -0.13%     
==========================================
  Files         309      309              
  Lines       15863    15861       -2     
==========================================
- Hits        13139    13117      -22     
- Misses       2724     2744      +20     

Impacted Files	Coverage Δ
torch_geometric/data/collate.py	96.66% <ø> (ø)
torch_geometric/data/separate.py	97.77% <ø> (ø)
torch_geometric/nn/conv/utils/typing.py	81.25% <0.00%> (-17.50%)	⬇️
torch_geometric/io/tu.py	93.58% <0.00%> (-2.57%)	⬇️
torch_geometric/graphgym/utils/io.py	78.04% <0.00%> (-2.44%)	⬇️
torch_geometric/nn/models/mlp.py	98.41% <0.00%> (-1.59%)	⬇️
torch_geometric/transforms/gdc.py	77.94% <0.00%> (-1.03%)	⬇️
torch_geometric/nn/conv/rgat_conv.py	83.76% <0.00%> (-0.53%)	⬇️
torch_geometric/graphgym/config.py	94.52% <0.00%> (-0.50%)	⬇️
torch_geometric/graphgym/utils/comp_budget.py	15.51% <0.00%> (+0.51%)	⬆️

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