fix extract for a single point

[tiemvanderdeure]

Adds a return statement so that extract(ras, (x,y)) no longer returns 1 :)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.99%. Comparing base (a15ebb1) to head (f4415c9).
Report is 152 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #877      +/-   ##
==========================================
+ Coverage   82.32%   82.99%   +0.67%     
==========================================
  Files          60       58       -2     
  Lines        4357     5317     +960     
==========================================
+ Hits         3587     4413     +826     
- Misses        770      904     +134     

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