ReadOfKernelArgsError: fix no attribute error

[yuravk]

• AttributeError: module 'leapp.reporting' has no attribute 'Hints'

[github-actions]

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[pirat89]

@yuravk thank you for the contribution! I see we really missed that one. Could you also add unit-test to cover this part of the code? it's not blocker, but we see it has been missing all the time, which is one of reason why we missed this.