fix(txt-suffix): avoid crash on domain without dot

[titilambert]

Description

This PR fix issue when suffix is used and the domain has no dot

Fixes #1668

Checklist

• Unit tests updated
• [N/A] End user documentation updated

[k8s-ci-robot]

Hi @titilambert. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[mloiseleur]

/retitle fix(txt-suffix): avoid crash on domain without dot

[mloiseleur]

/ok-to-test
@titilambert Wdyt of adding a log, too ?

[titilambert]

/ok-to-test @titilambert Wdyt of adding a log, too ?

Good idea ! I will add a commit later today.

[titilambert]

/ok-to-test @titilambert Wdyt of adding a log, too ?

Done !

[mloiseleur]

Keywords which can automatically close issues and at(@) or hashtag(#) mentions are not allowed in commit messages.

The list of commits with invalid commit messages:

* [85a4b15](https://github.com/kubernetes-sigs/external-dns/commits/85a4b154f160819dcc8f469414d5e90fde1d64f8) Fix [wrong host entry crashes the whole external-dns pod #1668](https://github.com/kubernetes-sigs/external-dns/issues/1668)

@titilambert You have to fix this commit, too.

[titilambert]

Keywords which can automatically close issues and at(@) or hashtag(#) mentions are not allowed in commit messages.
The list of commits with invalid commit messages:

* [85a4b15](https://github.com/kubernetes-sigs/external-dns/commits/85a4b154f160819dcc8f469414d5e90fde1d64f8) Fix [wrong host entry crashes the whole external-dns pod #1668](https://github.com/kubernetes-sigs/external-dns/issues/1668)

@titilambert You have to fix this commit, too.

Sorry, I missed it. I just squashed, changed commit message and force pushed.

[titilambert]

Keywords which can automatically close issues and at(@) or hashtag(#) mentions are not allowed in commit messages.
The list of commits with invalid commit messages:

* [85a4b15](https://github.com/kubernetes-sigs/external-dns/commits/85a4b154f160819dcc8f469414d5e90fde1d64f8) Fix [wrong host entry crashes the whole external-dns pod #1668](https://github.com/kubernetes-sigs/external-dns/issues/1668)

@titilambert You have to fix this commit, too.

Sorry, I missed it. I just squashed, changed commit message and force pushed.

Done

[mloiseleur]

/lgtm
/assign @Raffo

@Raffo: I'll let you decide if we should keep or not those debug logs.

[Raffo]

I don't think they are super informative and won't really help in a running system. I understand the use for development, but I think we should remove them. Can you take care of this @titilambert ?

[k8s-ci-robot]

New changes are detected. LGTM label has been removed.

[k8s-ci-robot]

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[titilambert]

I don't think they are super informative and won't really help in a running system. I understand the use for development, but I think we should remove them. Can you take care of this @titilambert ?

done !