sources.generic: don't unregister non-registered sources on drop

[elinorbgr]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.47% ⚠️

Comparison is base (92b42b1) 86.85% compared to head (2132f3a) 86.38%.

❗ Current head 2132f3a differs from pull request most recent head a893e76. Consider uploading reports for the commit a893e76 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #153      +/-   ##
==========================================
- Coverage   86.85%   86.38%   -0.47%     
==========================================
  Files          14       13       -1     
  Lines        1818     1748      -70     
==========================================
- Hits         1579     1510      -69     
+ Misses        239      238       -1     

Flag	Coverage Δ
macos-latest	?
ubuntu-latest	86.38% <100.00%> (-0.01%)	⬇️

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Files Changed	Coverage Δ
src/sources/generic.rs	75.42% <100.00%> (-0.21%)	⬇️

... and 1 file with indirect coverage changes

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