Support empty LowRankFun

[jishnub]

No description provided.

[codecov]

Codecov Report

Base: 68.39% // Head: 61.73% // Decreases project coverage by -6.65% ⚠️

Coverage data is based on head (0a57421) compared to base (a3bc2dc).
Patch coverage: 91.66% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #283      +/-   ##
==========================================
- Coverage   68.39%   61.73%   -6.66%     
==========================================
  Files          78       78              
  Lines        8093     8115      +22     
==========================================
- Hits         5535     5010     -525     
- Misses       2558     3105     +547     

Impacted Files	Coverage Δ
src/Multivariate/VectorFun.jl	51.04% <ø> (-21.88%)	⬇️
src/Multivariate/LowRankFun.jl	46.76% <90.90%> (-21.94%)	⬇️
src/Multivariate/ProductFun.jl	29.76% <100.00%> (-15.48%)	⬇️
src/onehotvector.jl	0.00% <0.00%> (-100.00%)	⬇️
src/Multivariate/Multivariate.jl	5.66% <0.00%> (-50.95%)	⬇️
src/PDE/PDE.jl	34.21% <0.00%> (-50.01%)	⬇️
src/Domains/Domains.jl	0.00% <0.00%> (-48.79%)	⬇️
src/Operators/general/PartialInverseOperator.jl	50.00% <0.00%> (-48.22%)	⬇️
src/Operators/systems.jl	9.09% <0.00%> (-45.46%)	⬇️
src/Spaces/QuotientSpace.jl	39.08% <0.00%> (-43.11%)	⬇️
... and 54 more

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