x-pack/filebeat/input/entityanalytics/provider/okta/internal/okta: handle empty responses gracefully

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• My code follows the style guidelines of this project
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• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
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Related issues

• Ref [entityanalytics_okta] System tests not producing expected event data in 8.11 integrations#8468

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