Validate the eval dataset in advance.
Author: jackyjinjing
Pull request: yes

# What does this PR do?
Validate whether the eval dataset is empty in advance to avoid wasting the time of training for one epoch only to discover this issue.<!--
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Fixes # (issue)
fix #33721 

## Before submitting
- [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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## Who can review?

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