[PM-17609] Filter out null emissions during decryption

[BTreston]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-17609

📔 Objective

This PR fixes an issue where cipherView$ may emit null during encryption. This is an expected behavior, so we will filter out the null emission at the consumer of this observable.

📸 Screenshots

Screen.Recording.2025-02-12.at.9.21.09.AM.mov

⏰ Reminders before review

• Contributor guidelines followed
• All formatters and local linters executed and passed
• Written new unit and / or integration tests where applicable
• Protected functional changes with optionality (feature flags)
• Used internationalization (i18n) for all UI strings
• CI builds passed
• Communicated to DevOps any deployment requirements
• Updated any necessary documentation (Confluence, contributing docs) or informed the documentation team

🦮 Reviewer guidelines

• 👍 (:+1:) or similar for great changes
• 📝 (:memo:) or ℹ️ (:information_source:) for notes or general info
• ❓ (:question:) for questions
• 🤔 (:thinking:) or 💭 (:thought_balloon:) for more open inquiry that's not quite a confirmed issue and could potentially benefit from discussion
• 🎨 (:art:) for suggestions / improvements
• ❌ (:x:) or ⚠️ (:warning:) for more significant problems or concerns needing attention
• 🌱 (:seedling:) or ♻️ (:recycle:) for future improvements or indications of technical debt
• ⛏ (:pick:) for minor or nitpick changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.29%. Comparing base (b036d6c) to head (289a491).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #13374   +/-   ##
=======================================
  Coverage   35.29%   35.29%           
=======================================
  Files        3124     3124           
  Lines       92483    92484    +1     
  Branches    16818    16818           
=======================================
+ Hits        32638    32639    +1     
  Misses      57388    57388           
  Partials     2457     2457           

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Checkmarx One – Scan Summary & Details – da8894aa-3280-40be-b416-df760031462a

Great job, no security vulnerabilities found in this Pull Request