moira-alert / moira / 3551

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fix(notifier): Handle nil pointer dereference

At notifier/plotting.go inside fetchAvailableSeries in case of error
returned from `metricsSource.Fetch` only
`local.ErrEvaluateTargetFailedWithPanic` was checked. Another errors did
not handled properly and function was trying to call mehods of fetch
result which became nil. That caused Nil Pointer Dereference panic. Add
proper error handling to prevent nil pointer dereference.

Closes #437

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