fix: expressifying empty factored elements

[thofma]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 75.90%. Comparing base (7d52dcb) to head (c236d5e).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Misc/FactoredElem.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1672       +/-   ##
===========================================
+ Coverage    6.49%   75.90%   +69.40%     
===========================================
  Files         361      361               
  Lines      113587   113783      +196     
===========================================
+ Hits         7383    86366    +78983     
+ Misses     106204    27417    -78787     

Files with missing lines	Coverage Δ
src/Misc/FactoredElem.jl	69.42% <0.00%> (+29.71%)	⬆️

... and 320 files with indirect coverage changes