[release/8.0] Throw for empty strings in primitive collection columns #32928
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Port of #32924
Fixes #32896
Description
The empty string is not valid JSON. EF will never write this, but if a database column contains the empty string, then EF should throw.
Customer impact
Hang when using a column containing an empty string as a primitive collection.
How found
Customer reported on 8.
Regression
No, primitive collections are a new feature in 8.
Testing
Tests added.
Risk
Low. Quirked.