Don't require empty objects when referencing custom components

[jack-berg]

Currently, when referencing a custom processor, exporter, sampler, etc, you need to specify an empty object as config (i.e. {}).

This is a bug.

This PR fixes the bug.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.28%. Comparing base (46b2fcd) to head (661c417).
Report is 5 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6891      +/-   ##
============================================
- Coverage     90.29%   90.28%   -0.01%     
- Complexity     6588     6589       +1     
============================================
  Files           729      729              
  Lines         19767    19769       +2     
  Branches       1944     1945       +1     
============================================
+ Hits          17848    17849       +1     
  Misses         1327     1327              
- Partials        592      593       +1     

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