Fill nodata of bright building top as urban

[emmaai]

As the title, changes,

• added nodata & artificial as artificial
• altered test to cover the case and confirm no impact for the rest

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.50%. Comparing base (0cf4d97) to head (1fb99de).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #179   +/-   ##
========================================
  Coverage    81.50%   81.50%           
========================================
  Files           50       50           
  Lines         4600     4602    +2     
========================================
+ Hits          3749     3751    +2     
  Misses         851      851           

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