[BugFix] Fix bug delete empty list partition report an error (backport #37461)

[mergify]

This is an automatic backport of pull request #37461 done by Mergify.

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Why I'm doing:

for empty list partition table.
delete report an error ERROR 1064 (HY000): Index: 0, Size: 0

What I'm doing:
fix this problem.

Fixes #issue

What type of PR is this:

• BugFix
• Feature
• Enhancement
• Refactor
• UT
• Doc
• Tool

Does this PR entail a change in behavior?

• Yes, this PR will result in a change in behavior.
• No, this PR will not result in a change in behavior.

If yes, please specify the type of change:

• Interface/UI changes: syntax, type conversion, expression evaluation, display information
• Parameter changes: default values, similar parameters but with different default values
• Policy changes: use new policy to replace old one, functionality automatically enabled
• Feature removed
• Miscellaneous: upgrade & downgrade compatibility, etc.

Checklist:

• I have added test cases for my bug fix or my new feature
• This pr needs user documentation (for new or modified features or behaviors)
  • I have added documentation for my new feature or new function
• This is a backport pr

[github-actions]

[FE Incremental Coverage Report]

❌ fail : 0 / 2 (00.00%)

file detail

	path	covered_line	new_line	coverage	not_covered_line_detail
🔵	com/starrocks/load/DeleteMgr.java	0	2	00.00%	[236, 237]

[github-actions]

[BE Incremental Coverage Report]

✅ pass : 0 / 0 (0%)