Fixes for trivial non-simple fields

[thofma]

Closes #1257.

[codecov]

Codecov Report

Attention: 57 lines in your changes are missing coverage. Please review.

Comparison is base (d8aa190) 74.55% compared to head (5e9abba) 74.53%.
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1259      +/-   ##
==========================================
- Coverage   74.55%   74.53%   -0.03%     
==========================================
  Files         346      346              
  Lines      110993   110967      -26     
==========================================
- Hits        82756    82712      -44     
- Misses      28237    28255      +18     

Files	Coverage Δ
src/AlgAss/AlgAss.jl	87.24% <100.00%> (ø)
src/AlgAss/Elem.jl	89.89% <ø> (ø)
src/AlgAssAbsOrd/LocallyFreeClassGroup.jl	92.30% <100.00%> (ø)
src/AlgAssAbsOrd/Order.jl	80.38% <100.00%> (-0.51%)	⬇️
src/EllCrv/EllCrv.jl	95.57% <100.00%> (ø)
src/EllCrv/Finite.jl	94.61% <100.00%> (+0.17%)	⬆️
src/EllCrv/Heights.jl	92.43% <100.00%> (ø)
src/EllCrv/Isogeny.jl	90.68% <100.00%> (ø)
src/EllCrv/Isomorphisms.jl	90.85% <100.00%> (ø)
src/FunField/Factor.jl	43.79% <100.00%> (ø)
... and 55 more

... and 22 files with indirect coverage changes

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