fix: allow empty filter

[nicky-lenaers]

No description provided.

[codecov]

Codecov Report

Merging #14 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #14   +/-   ##
=======================================
  Coverage   98.93%   98.93%           
=======================================
  Files          12       12           
  Lines         283      283           
  Branches       69       70    +1     
=======================================
  Hits          280      280           
  Misses          2        2           
  Partials        1        1

Impacted Files	Coverage Δ
src/pagination/types/page-args.ts	100% <ø> (ø)	⬆️
src/pagination/helpers.ts	100% <100%> (ø)	⬆️

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