send back null for wiped dataclips

[taylordowns2000]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 89.63%. Comparing base (6adbdd3) to head (1299d76).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/lightning/dataclip_scrubber.ex	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3652      +/-   ##
==========================================
- Coverage   89.65%   89.63%   -0.02%     
==========================================
  Files         410      410              
  Lines       17075    17076       +1     
==========================================
- Hits        15308    15306       -2     
- Misses       1767     1770       +3     

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