[#174837880] Prevent errors when no notification is found

[balanza]

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[pagopa-github-bot]

	Warnings
⚠️	Please include a description of your PR changes.

Affected stories

• 🐞 #174837880: Se, durante l'eliminazione dei dati utente, non viene trovato la notifica per un messaggio, la procedura si blocca quando dovrebbe invece proseguire

Generated by 🚫 dangerJS

[codecov-commenter]

Codecov Report

Merging #79 into master will increase coverage by 0.10%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##           master      #79      +/-   ##
==========================================
+ Coverage   84.92%   85.03%   +0.10%     
==========================================
  Files          41       41              
  Lines        1360     1363       +3     
  Branches      109      112       +3     
==========================================
+ Hits         1155     1159       +4     
+ Misses        201      200       -1     
  Partials        4        4              

Impacted Files	Coverage Δ
DeleteUserDataActivity/backupAndDelete.ts	92.85% <87.50%> (+1.81%)	⬆️

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