[Suggestion]Change the notification "Cannot read property 'path' of undefined" to " The documents do not contain the partition key"

[v-xinda]

OS: Mac
Build Version: 20200623.1

Repro step:

1. Drill down on a Collection with partition key.
2. Right click -->Click "Import Document into a Collection…".
3. Select a .json file doesn't contain the partition key.

Actual:
Pop up an error notification "Cannot read property 'path' of undefined".

Suggestion:
Pop up an error notification "The documents do not contain the partition key".

More Info:

[]3:14:11 PM: The following documents do not contain the required partition key:
/Users/azuretoolstest/Desktop/Attachments for Cosmos DB/Reserves.json
3:14:11 PM: Error: Cannot read property 'path' of undefined