pf z, io.unalloc=true: Abort map check loop if the size-0 map is encountered

[kazarmy]

No description provided.

[codecov-io]

Codecov Report

Merging #13843 into master will decrease coverage by <.01%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master   #13843      +/-   ##
==========================================
- Coverage   37.07%   37.07%   -0.01%     
==========================================
  Files         941      941              
  Lines      302417   302420       +3     
==========================================
- Hits       112118   112117       -1     
- Misses     190299   190303       +4

Impacted Files	Coverage Δ
libr/util/format.c	66.89% <33.33%> (-0.06%)	⬇️
libr/core/project.c	56.72% <0%> (-0.35%)	⬇️

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