chore: skip publishing the last empty struct when generator stops (#… #1263

Job	Run time
build-rust-amd64	6m 10s
build-rust-amd64	6m 10s
build-rust-amd64	6m 10s
build-rust-arm64	6m 59s
build-rust-arm64	6m 59s
build-rust-arm64	6m 59s
Build binaries	6m 56s
Build binaries	6m 56s
Build binaries	6m 56s
Build & push linux/amd64 and linux/arm64 (numaflow)	4m 50s
Build & push linux/amd64 and linux/arm64 (numaflow)	3m 23s
Build & push linux/amd64 and linux/arm64 (numaflow)	2m 20s
Bom	0s
Bom	0s
Bom	1m 25s
Release	0s
Release	0s
Release	39s
	1h 12m 52s

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