Pulsar scaler: not clear error messages for unsuccessful connection

[zroubalik]

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Expected Behavior

Error messages to be clear and not contain %!s(<nil>) etc.

Actual Behavior

2023-05-19T15:01:46Z    ERROR   scalehandler    Error getting scale decision    {"scaledobject.Name": "my-scaledobject", "scaledObject.Namespace": "namespace", "scaleTarget.Name": "my-worker", "error": "error requesting stats from url: %!s(<nil>)"}

Steps to Reproduce the Problem

1. Deploy Pulsar with wrong connection metadata

Logs from KEDA operator

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KEDA Version

2.10.1

Kubernetes Version

None

Platform

None

Scaler Details

No response

Anything else?

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