[Fixes #14369] Map thumbnail is not saved if remote WMS without servi…

[mattiagiupponi]

…ce are uploaded

Checklist

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[gemini-code-assist]

Code Review

This pull request updates the thumbnail generation logic in geonode/thumbs/thumbnails.py to use dataset.ows_url as a fallback when dataset.remote_service is not available. The reviewer correctly identified a potential AttributeError on an earlier line (line 340) where dataset.remote_service.service_url is accessed without a null check, and suggested refactoring the block to safely resolve the service URL first.

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[giohappy]

I don't like much the pre-existing dataset_ows_url property. A private model field with an ows_url getter/setter is better, but I'm fine to keep it for the moment.

[github-actions]

The backport to 5.1.x failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-5.1.x 5.1.x
# Navigate to the new working tree
cd .worktrees/backport-5.1.x
# Create a new branch
git switch --create backport-14372-to-5.1.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 36ce3dc5bc5f2d82736ba6c024e977782c85771d
# Push it to GitHub
git push --set-upstream origin backport-14372-to-5.1.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-5.1.x

Then, create a pull request where the base branch is 5.1.x and the compare/head branch is backport-14372-to-5.1.x.