Adding a short check to see if mean magnitude is passed into variable signal

[Henry-Best-01]

Include a small check if a mean magnitude kwarg is passed to the lamppost reprocessed signal

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.74%. Comparing base (ac07439) to head (149032d).
Report is 53 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #256      +/-   ##
==========================================
- Coverage   97.89%   97.74%   -0.15%     
==========================================
  Files          70       70              
  Lines        4652     4666      +14     
==========================================
+ Hits         4554     4561       +7     
- Misses         98      105       +7     

Flag	Coverage Δ
	97.74% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...s/SourceVariability/accretion_disk_reprocessing.py	100.00% <100.00%> (ø)
slsim/Sources/SourceVariability/variability.py	100.00% <100.00%> (ø)
slsim/Sources/agn.py	100.00% <100.00%> (ø)
slsim/Sources/source.py	98.95% <100.00%> (ø)

... and 3 files with indirect coverage changes

[Henry-Best-01]

@nkhadka21, do you have any advice on how I can get codecov/project to succeed?

[nkhadka21]

Hi @Henry-Best-01, thank you very much for this PR! It looks good to me.