disable survey modal if no survey

[danlipert]

Description

Disables the hackathon survey modal during onboarding if there is no survey

Refers/Fixes

#6128

Testing

tested locally

[codecov]

Codecov Report

Merging #6544 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #6544   +/-   ##
=======================================
  Coverage   27.30%   27.30%           
=======================================
  Files         287      287           
  Lines       26801    26801           
  Branches     3962     3962           
=======================================
  Hits         7317     7317           
+ Misses      19216    19212    -4     
- Partials      268      272    +4     

Impacted Files	Coverage Δ
app/dashboard/views.py	11.04% <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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