[SPARK-14739] [PySpark] Fix bug while parsing all zero sparse vectors #12510
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What changes were proposed in this pull request?
The PySpark deserialization has a bug that shows while deserializing all zero sparse vectors. This fix filters out empty string tokens before casting, hence properly stringified SparseVectors successfully get parsed.
How was this patch tested?
Added an inline test similar to other tests in the init.py file.