fix: panic on gocql

[skynet2]

Currently there is a possibility to receive a panic, while using apmgocql module, this situation can occur while passing context which does not have apm transaction attached

[ghost]

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• Start Time: 2021-12-23T02:06:37.188+0000

• Duration: 31 min 7 sec

• Commit: cdbf39e

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Test	Results
Failed	0
Passed	11977
Skipped	279
Total	12256

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[marclop]

@skynet2 thanks for submitting this contribution, the change looks sensible to me. Would you mind signing the contributor agreement? Here's a link to it: https://www.elastic.co/contributor-agreement.

[skynet2]

Hi @marclop ,
Done, thanks.

[marclop]

LGTM. Thank you for the contribution.

[marclop]

run elasticsearch-ci/docs