fix: Fallback to icon if collection cover fails to load

[artonge]

No description provided.

[artonge]

/backport to stable31

[artonge]

/backport to stable30

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 2.24%. Comparing base (5cd8975) to head (477f8b7).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #3133      +/-   ##
=========================================
- Coverage    2.24%   2.24%   -0.01%     
=========================================
  Files         107     107              
  Lines        6504    6509       +5     
  Branches      121     121              
=========================================
  Hits          146     146              
- Misses       6353    6358       +5     
  Partials        5       5              

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[backportbot]

The backport to stable30 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable30
git pull origin stable30

# Create the new backport branch
git checkout -b backport/3133/stable30

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 477f8b7d

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/3133/stable30

Error: Failed to check for changes with origin/stable30: No changes found in backport branch

---

Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.

[backportbot]

The backport to stable31 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable31
git pull origin stable31

# Create the new backport branch
git checkout -b backport/3133/stable31

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 477f8b7d

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/3133/stable31

Error: Failed to check for changes with origin/stable31: No changes found in backport branch

---

Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.