Fixes empty filter bug from ibis breaking changes

[pablo-gar]

Fixes #77

All test pass after this fix in python 3.10 and 3.11

[codecov-commenter]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 93.12%. Comparing base (3b6899c) to head (245cd1c). :warning: Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #79      +/-   ##
==========================================
+ Coverage   92.94%   93.12%   +0.18%     
==========================================
  Files           6        6              
  Lines         340      349       +9     
==========================================
+ Hits          316      325       +9     
  Misses         24       24              

Files with missing lines	Coverage Δ
src/genomic_features/ensembl/ensembldb.py	93.20% <100.00%> (+0.31%)	:arrow_up:

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[dgruano]

Any chance this could be merged? Seems an important bug!