DM-34375: Fix for a NULL component bug

[andy-slac]

The bug was introduced in a previous merge (#672 )

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

Merging #675 (09716dc) into main (da25978) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #675   +/-   ##
=======================================
  Coverage   84.26%   84.26%           
=======================================
  Files         242      242           
  Lines       30968    30971    +3     
  Branches     5216     5217    +1     
=======================================
+ Hits        26094    26097    +3     
  Misses       3707     3707           
  Partials     1167     1167           

Impacted Files	Coverage Δ
python/lsst/daf/butler/core/storedFileInfo.py	85.91% <100.00%> (+0.62%)	⬆️

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