Fix null container #5396

Job	Run time
Lint	34s
Code Style	54s
SDK docs	1m 27s
Get minimum supported rust version	15s
WASM Tests (stable, false)	1m 14s
E2E Tests (stable, false)	1m 4s
WASM Tests (1.76, false)	2m 29s
SDK Tests (stable, false)	2m 32s
E2E Tests (1.76, false)	1m 14s
WASM Tests (nightly, true)	1m 14s
SDK Tests (1.76, false)	4m 28s
E2E Tests (nightly, true)	1m 9s
SDK Tests (nightly, true)	3m 22s
	21m 56s

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