[Bug] Fixing Bug in test_change_etype_to_canonical_etype.py::test_hetero_graph Test.

[drivanov]

Description

The following tests are failing:

FAILED tests/tools/test_dist_part.py::test_pipeline_arbitrary_chunks[1-8-4-1-1] - dgl._ffi.base.DGLError: [18:50:07] /opt/dgl/dgl-source/third_party/dmlc-core/src/io/local_filesys.cc:209: Check failed: allow_null:  LocalFileSystem::Open "/tmp/tmp0xrr_81s/partitioned/part...
FAILED tests/tools/test_dist_part.py::test_pipeline_arbitrary_chunks[1-4-4-1-1] - dgl._ffi.base.DGLError: [18:50:17] /opt/dgl/dgl-source/third_party/dmlc-core/src/io/local_filesys.cc:209: Check failed: allow_null:  LocalFileSystem::Open "/tmp/tmpelqoxwt6/partitioned/part...
FAILED tests/tools/test_dist_part.py::test_pipeline_arbitrary_chunks[3-4-4-3-3] - dgl._ffi.base.DGLError: [18:50:28] /opt/dgl/dgl-source/third_party/dmlc-core/src/io/local_filesys.cc:209: Check failed: allow_null:  LocalFileSystem::Open "/tmp/tmpunrp3p5y/partitioned/part...
FAILED tests/tools/test_dist_part.py::test_pipeline_arbitrary_chunks[1-4-2-1-1] - dgl._ffi.base.DGLError: [18:50:39] /opt/dgl/dgl-source/third_party/dmlc-core/src/io/local_filesys.cc:209: Check failed: allow_null:  LocalFileSystem::Open "/tmp/tmpwikubuyu/partitioned/part...

The root cause of this issue is the attempt to access featdata_key.shape when featdata_key is None.
The fix is quite obvious.

Checklist

Please feel free to remove inapplicable items for your PR.

• The PR title starts with [$CATEGORY] (such as [NN], [Model], [Doc], [Feature]])
• I've leverage the tools to beautify the python and c++ code.
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• To the best of my knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change

Changes

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Commit ID: eb3b8d690de632cc595ed49dd5c7b32fbce2d447

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Commit ID: 8f4d70f5e8a82eea9b4d76753387556297b6d173

Build ID: 4

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