Abin Simon 3706ae6c14
Handle groups without SharePoint sites (#4095)
Security groups will not have an associated site. This avoids trying
to backup the site if we get an error that the site is not available.

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#### Does this PR need a docs update or release note?

- [ ]  Yes, it's included
- [ ] 🕐 Yes, but in a later PR
- [x]  No

#### Type of change

<!--- Please check the type of change your PR introduces: --->
- [ ] 🌻 Feature
- [ ] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Supportability/Tests
- [ ] 💻 CI/Deployment
- [x] 🧹 Tech Debt/Cleanup

#### Issue(s)

<!-- Can reference multiple issues. Use one of the following "magic words" - "closes, fixes" to auto-close the Github issue. -->
* https://github.com/alcionai/corso/issues/3990

#### Test Plan

<!-- How will this be tested prior to merging.-->
- [ ] 💪 Manual
- [ ]  Unit test
- [ ] 💚 E2E
2023-09-11 08:14:15 +00:00
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2023-09-06 17:15:40 +00:00
2023-09-06 17:15:40 +00:00