[opampsupervisor] fix panic on shutdown #29955
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**Description:** Fixes panic reported in https://github.com/open-telemetry/opentelemetry-collector-contrib/actions/runs/7236299619/job/19714748723?pr=29950 ``` panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x8d5d84] goroutine 49 [running]: github.com/open-telemetry/opentelemetry-collector-contrib/cmd/opampsupervisor/supervisor/commander.(*Commander).Stop.func1() /home/runner/work/opentelemetry-collector-contrib/opentelemetry-collector-contrib/cmd/opampsupervisor/supervisor/commander/commander.go:157 +0x1e4 created by github.com/open-telemetry/opentelemetry-collector-contrib/cmd/opampsupervisor/supervisor/commander.(*Commander).Stop /home/runner/work/opentelemetry-collector-contrib/opentelemetry-collector-contrib/cmd/opampsupervisor/supervisor/commander/commander.go:153 +0x[21](https://github.com/open-telemetry/opentelemetry-collector-contrib/actions/runs/7236299619/job/19714748723?pr=29950#step:8:22)a exit status 2 FAIL github.com/open-telemetry/opentelemetry-collector-contrib/cmd/opampsupervisor 1.520s ```
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Description:
Fixes panic reported in https://github.com/open-telemetry/opentelemetry-collector-contrib/actions/runs/7236299619/job/19714748723?pr=29950