Fix crash due to missing ingress http block

[ebabani]

It's acceptable although uncommon for an ingress to have a rule and a host,
but no HTTP block for that particular rule.

What this PR does / why we need it:
Fixes a crash when an ingress exists with rules but no HTTP block.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

[tariq1890]

Thanks for the fix @ebabani . @brancz This is definitely a bug fix. Do you think we should backport this to release 1.7 and release 1.6?

[brancz]

I'm thinking 1.7 only, #830 looks like a candidate for a v1.7.1 as well

[tariq1890]

Fine with me. I'll retarget this PR.

[tariq1890]

@ebabani Can you rebase this PR against the release-1.7 branch?

[tariq1890]

/hold

Putting the PR on hold until it's rebased.

[ebabani]

This does not need to be backported to 1.6.x, these metrics were first added in 1.7. I'll rebase the PR

[ebabani]

/assign @brancz

[tariq1890]

I still see non-release commits from the master branch in this PR. Can you fix that?

[ebabani]

Very odd, but should be fixed now. Sorry about that @tariq1890

[tariq1890]

/lgtm

Thanks @ebabani !

[tariq1890]

I will wait on @brancz for final approval :).

[brancz]

/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: brancz, ebabani, tariq1890

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