Avoid doing invalid range requests if a node has no points

[uclaros]

Description

If a remote copc file would have empty nodes, we would craft an invalid range request to the server (lower bound > upper bound) and the server would reply with the whole copc, which could be huge.

Fixes #55210

[github-actions]

🪟 Windows builds ready!

Windows builds of this PR are available for testing here. Debug symbols for this build are available here.

(Built from commit 973c39b)

[qgis-bot]

The backport to release-3_34 failed:

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

stderr

error: could not apply 973c39b134e... Avoid doing invalid range requests if a node has no points
hint: After resolving the conflicts, mark them with
hint: "git add/rm <pathspec>", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".

stdout

Auto-merging src/3d/symbols/qgspointcloud3dsymbol_p.cpp
Auto-merging src/core/pointcloud/qgscopcpointcloudblockrequest.cpp
CONFLICT (content): Merge conflict in src/core/pointcloud/qgscopcpointcloudblockrequest.cpp
Auto-merging src/core/pointcloud/qgspointcloudstatscalculator.cpp
Auto-merging src/core/pointcloud/qgsremotecopcpointcloudindex.cpp
CONFLICT (content): Merge conflict in src/core/pointcloud/qgsremotecopcpointcloudindex.cpp

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-release-3_34 release-3_34
# Navigate to the new working tree
cd .worktrees/backport-release-3_34
# Create a new branch
git switch --create backport-56265-to-release-3_34
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick 973c39b134e74d1a2b1b4cb53b3c7074e9cd5542
# Push it to GitHub
git push --set-upstream origin backport-56265-to-release-3_34
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-release-3_34

Then, create a pull request where the base branch is release-3_34 and the compare/head branch is backport-56265-to-release-3_34.