syz-ci: fix null dereference when JobManager creation fails, skip whe… #145

Job	Run time
build	1s
aux	4m 45s
dashboard	1s
race	1s
old	7m 2s
race_dashboard	1s
arch (presubmit_arch_darwin)	3m 37s
arch (presubmit_arch_windows)	3m 28s
arch (presubmit_arch_openbsd)	3m 41s
gvisor	4m 6s
arch (presubmit_arch_executor)	3m 3s
arch (presubmit_arch_freebsd)	6m 20s
arch (presubmit_arch_netbsd)	3m 47s
arch (presubmit_arch_linux)	10m 39s
	50m 32s

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