Check for sitemaps.log instead of sitemaps directory

[mekarpeles]

Fixes the first part of #7581, correctly implements #11625

Fixes a bug where absence of sitemap directory is preventing sitemaps from being run after --overwrite deletes sitemaps/ directory.

This pull request makes a small change to the sitemap generation logic in scripts/oldump.sh. The script now checks for the existence of the sitemaps.log file instead of the sitemaps directory before generating sitemaps.

[Copilot]

Pull request overview

This PR fixes a bug in the sitemap generation logic where checking for directory existence was insufficient to determine whether sitemaps needed to be regenerated. The change improves reliability by checking for the actual completion marker (sitemaps.log file) instead of just the directory.

Key Changes:

• Modified the sitemap generation condition to check for sitemaps.log file instead of the sitemaps/ directory
• Aligns with the pattern used elsewhere in the script where file existence (rather than directory existence) indicates completion
• Better handles edge cases where the directory exists but contains no or incomplete sitemap data

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[mekarpeles]

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