fix rasterization for a single feature

[rafaqz]

Bugfix and test rasterizing a single feature.

[codecov-commenter]

Codecov Report

Merging #323 (8c9ec28) into main (89b4aab) will increase coverage by 0.34%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main     #323      +/-   ##
==========================================
+ Coverage   78.73%   79.08%   +0.34%     
==========================================
  Files          38       38              
  Lines        2949     3026      +77     
==========================================
+ Hits         2322     2393      +71     
- Misses        627      633       +6     

Impacted Files	Coverage Δ
src/lookup.jl	66.93% <0.00%> (ø)
src/methods/extract.jl	78.94% <0.00%> (ø)
src/openstack.jl	57.14% <0.00%> (ø)
src/polygon_ops.jl	78.59% <41.66%> (ø)
src/methods/rasterize.jl	86.04% <85.71%> (+3.20%)	⬆️
src/sources/gdal.jl	86.22% <0.00%> (-0.28%)	⬇️

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