Spark - prevent NPE if context is null

[pawel-big-lebowski]

Problem

prevent NPE if context is null -> check if is null

Solution

Please describe your change as it relates to the problem, or bug fix, as well as any dependencies. If your change requires a schema change, please describe the schema modification(s) and whether it's a backwards-incompatible or backwards-compatible change, then select one of the following:

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• Your change modifies the core OpenLineage model
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One-line summary:

Checklist

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SPDX-License-Identifier: Apache-2.0
Copyright 2018-2023 contributors to the OpenLineage project

[harels]

Thanks @pawel-big-lebowski !