Minor generalisation of return_value for LinearCombinationMap

[JordiManyer]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.84%. Comparing base (abe7c5a) to head (3687999).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1298   +/-   ##
=======================================
  Coverage   88.84%   88.84%           
=======================================
  Files         227      227           
  Lines       29799    29799           
=======================================
  Hits        26475    26475           
  Misses       3324     3324           

Flag	Coverage Δ
drivers	39.91% <100.00%> (ø)
extensions	5.07% <0.00%> (ø)
unit-adaptivity	40.05% <100.00%> (ø)
unit-basics	14.71% <0.00%> (ø)
unit-celldata	21.11% <100.00%> (ø)
unit-fespaces-1	32.34% <100.00%> (ø)
unit-fespaces-2	38.83% <100.00%> (ø)
unit-fields	17.72% <100.00%> (ø)
unit-geometry	28.75% <100.00%> (ø)
unit-multifield	30.84% <100.00%> (ø)
unit-odes	28.71% <100.00%> (ø)
unit-referencefes	34.36% <100.00%> (ø)
unit-visualization	11.84% <100.00%> (ø)

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