Change lack-of-samples into a noisy warning (Refs. #335)

[LebedevRI]

To be reverted in December 2022 (~+11 months from the date of this commit),
see #335 (comment)

[codecov]

Codecov Report

Merging #336 (e96a4d1) into develop (a571881) will decrease coverage by 0.00%.
The diff coverage is 59.25%.

@@             Coverage Diff             @@
##           develop     #336      +/-   ##
===========================================
- Coverage    60.48%   60.47%   -0.01%     
===========================================
  Files          207      207              
  Lines        12608    12628      +20     
  Branches      1758     1761       +3     
===========================================
+ Hits          7626     7637      +11     
- Misses        4850     4859       +9     
  Partials       132      132              

Flag	Coverage Δ
integration	47.94% <61.53%> (+0.02%)	⬆️
rpu_u	47.94% <61.53%> (+0.02%)	⬆️
unittests	22.57% <33.33%> (+0.01%)	⬆️

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Impacted Files	Coverage Δ
src/librawspeed/decoders/RawDecoder.h	66.66% <ø> (ø)
src/librawspeed/metadata/Camera.h	100.00% <ø> (ø)
src/librawspeed/metadata/CameraMetaData.cpp	60.65% <0.00%> (ø)
src/librawspeed/decoders/RawDecoder.cpp	36.36% <33.33%> (-0.82%)	⬇️
src/utilities/rstest/rstest.cpp	52.50% <66.66%> (+0.17%)	⬆️
src/librawspeed/metadata/Camera.cpp	77.77% <90.00%> (+0.39%)	⬆️

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