Tenable: additional pipeline sanity checks

[kgeller]

What does this PR do?

Adding a couple missing sanity checks to the pipeline to address an SDH ( thank you again @efd6 )

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

Related issues

This PR + #4573 should address the following SDH

Relates https://github.com/elastic/sdh-beats/issues/2759

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• Start Time: 2022-11-21T13:44:01.470+0000

• Duration: 15 min 19 sec

Test stats 🧪

Test	Results
Failed	0
Passed	19
Skipped	0
Total	19

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (3/3)	💚
Files	100.0% (3/3)	💚 2.31
Classes	100.0% (3/3)	💚 2.31
Methods	100.0% (44/44)	💚 8.815
Lines	96.959% (1116/1151)	👍 5.254
Conditionals	100.0% (0/0)	💚

[efd6]

Can you add the testcase for this?

{"error_code":0,"error_msg":","response":{"endOffset":"1000","matchingDataElementCount":"0:0:0:0:0:0:0","results":[],"returnedRecords":0,"startOffset":"0","totalRecords":"0"},"timestamp":1257894000,"type":"regular","warnings":[]}