No contrib grants clr fix

[danlipert]

Description

this PR fixes a divide by zero error where the normalization factor could not be calculated during CLR

Refers/Fixes

n/a

Testing

not tested

[codecov]

Codecov Report

Merging #6602 into stable will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           stable    #6602      +/-   ##
==========================================
- Coverage   27.22%   27.22%   -0.01%     
==========================================
  Files         288      288              
  Lines       26865    26866       +1     
  Branches     3965     3966       +1     
==========================================
  Hits         7313     7313              
+ Misses      19284    19281       -3     
- Partials      268      272       +4     

Impacted Files	Coverage Δ
app/grants/clr.py	13.19% <0.00%> (-0.06%)	⬇️
app/dashboard/views.py	11.05% <0.00%> (ø)
...rketing/management/commands/no_applicants_email.py	0.00% <0.00%> (ø)
...eting/management/commands/assemble_leaderboards.py	40.48% <0.00%> (ø)

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