Fix a hang in write_matrix_market_csc#76

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rafal-c wants to merge 2 commits intoalugowski:mainfrom

rafal-c:bugfix/write_empty_csc_hangs

Commits on Mar 10, 2025

Don't split an empty csc matrix into multiple chunks inside csc_formatter::chunk::next_chunk. Trying to calculate the chunk size with nnz_per_columns being 0, which may happen for sparse arrays wit…
rafal-c
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Add a test for writing csc matrices where the number of columns is independent of the number of explicit values.
rafal-c
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