Preserve size of mask when all values are False in HeasarcClass.locate_data

[matteobachetti]

Resolve #3410

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.51%. Comparing base (e48e283) to head (ea9abd4).
⚠️ Report is 221 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3411   +/-   ##
=======================================
  Coverage   70.50%   70.51%           
=======================================
  Files         232      232           
  Lines       19999    19997    -2     
=======================================
- Hits        14101    14100    -1     
+ Misses       5898     5897    -1     

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[bsipocz]

cc @zoghbi-a

[bsipocz]

Thanks!