Fix test expectations for MCP protocol errors and null input handling… #26119

Job	Run time
lint-js	23s
lint-go	24s
bench	0s
actions-build	0s
logs-token-check	0s
audit	0s
js	0s
security	0s
test	0s
Integration: ${{ matrix.test-group.name }}	0s
build	0s
fuzz	0s
Security Scan: ${{ matrix.tool.name }}	0s
update	0s
	47s

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