<!-- PR description--> Fix: https://github.com/alcionai/corso/issues/3050 In case of a blank backup, don't go for snapshot deletion. #### Does this PR need a docs update or release note? - [ ] ⛔ No #### Type of change <!--- Please check the type of change your PR introduces: ---> - [x] 🐛 Bugfix #### 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/3050 #### Test Plan <!-- How will this be tested prior to merging.--> - [x] 💪 Manual - [ ] ⚡ Unit test