Abhishek Pandey 2300727b09
Sanitize recurrenceTimezone prior to restoring calendar event (#3064)
<!-- PR description-->
* Do not specify recurrenceTimeZone if it's not set in the item being
restored. "" is not a valid value
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#### Does this PR need a docs update or release note?

- [x]  No

#### Type of change

<!--- Please check the type of change your PR introduces: --->

- [x] 🐛 Bugfix


#### Issue(s)
* COR-53

#### Test Plan

<!-- How will this be tested prior to merging.-->
- [x] 💚 E2E
2023-04-10 13:17:53 -07:00
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