fix: Fix assertion panic on LazyFrame `scratch.is_empty()` #13507

Job	Run time
check-features	12m 38s
check-wasm	7m 46s
integration-test (ubuntu-latest)	3m 2s
test (ubuntu-latest)	4m 50s
integration-test (windows-latest)	7m 12s
test (windows-latest)	11m 41s
	47m 9s

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