Add null check to application form service

[wouterbles]

No description provided.

[codecov]

Codecov Report

Merging #352 (5d925ff) into master (147ccb5) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

❗ Current head 5d925ff differs from pull request most recent head 2f87ff5. Consider uploading reports for the commit 2f87ff5 to get more accurate results

@@             Coverage Diff              @@
##             master     #352      +/-   ##
============================================
- Coverage     33.43%   33.40%   -0.03%     
- Complexity      589      590       +1     
============================================
  Files            92       92              
  Lines          2285     2287       +2     
============================================
  Hits            764      764              
- Misses         1521     1523       +2     

Files	Coverage Δ
app/Services/AgendaApplicationFormService.php	0.00% <0.00%> (ø)

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