[enrich] Bugfix for hyperkitty. EnrichBackend can not get raw data.

[shanchenqi]

https://github.com/chaoss/grimoirelab-elk/issues/1038#issue-1155492569

[zhquan]

Hi @shanchenqi ,

Thank you very much for your PR.

Could you rebase and sign the commit?. Then I will proceed to merge it.

[shanchenqi]

Hello @zhquan , I have rebased my commit and signed the commit with my email.

[coveralls]

Pull Request Test Coverage Report for Build 1923100488

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 81.961%

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Totals
Change from base Build 1917130866:	0.0%
Covered Lines:	8769
Relevant Lines:	10699

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💛 - Coveralls