Fixed divide by zero on reading empty row group

[jorgecarleitao]

Closed #1060

[codecov]

Codecov Report

Merging #1062 (51173b4) into main (b0c601e) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #1062      +/-   ##
==========================================
- Coverage   81.32%   81.31%   -0.01%     
==========================================
  Files         363      363              
  Lines       34685    34689       +4     
==========================================
  Hits        28206    28206              
- Misses       6479     6483       +4     

Impacted Files	Coverage Δ
src/io/parquet/read/deserialize/null.rs	0.00% <0.00%> (ø)

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