[Fix] External materialization to S3 does not work if table is empty #808

Job	Run time
Check if MotherDuck v0.10.x token exists	1s
code-quality	1m 17s
Buena Vista functional test / python 3.11	2m 22s
build packages	12s
file-based functional test / python 3.9	2m 54s
fsspec test / python 3.9	55s
file-based functional test / python 3.10	2m 52s
functional test / python 3.9	2m 57s
file-based functional test / python 3.11	2m 54s
functional test / python 3.10	3m 23s
plugins test / python 3.11	54s
file-based functional test / python 3.12	2m 46s
unit test / python 3.9	57s
functional test / python 3.11	2m 55s
unit test / python 3.10	54s
functional test / python 3.12	3m 8s
unit test / python 3.11	52s
unit test / python 3.12	1m 7s
MotherDuck functional test / python 3.9	3m 59s
verify packages / python 3.9 / ubuntu-latest	28s
verify packages / python 3.10 / ubuntu-latest	25s
verify packages / python 3.11 / ubuntu-latest	26s
verify packages / python 3.12 / ubuntu-latest	36s
verify packages / python 3.9 / macos-latest	45s
verify packages / python 3.10 / macos-latest	57s
verify packages / python 3.11 / macos-latest	31s
verify packages / python 3.12 / macos-latest	39s
verify packages / python 3.9 / windows-latest	1m 27s
verify packages / python 3.10 / windows-latest	1m 8s
verify packages / python 3.11 / windows-latest	1m 6s
verify packages / python 3.12 / windows-latest	1m 34s
	47m 21s

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