fix ArgumentNullException exception when loading invalid CSDL

[quanterion]

When loading invalid CSDL model via
CsdlReader.Parse we get correct exception EdmException. But if we do it via CsdlReader.TryParse with ignoreUnexpectedAttributesAndElements option enabled we get instead System.ArgumentNullException: Value cannot be null. (Parameter 'key') because adding null version fails here https://github.com/OData/odata.net/blob/main/src/Microsoft.OData.Edm/Csdl/CsdlReader.cs#L339 and as get no critical errors due to https://github.com/OData/odata.net/blob/main/src/Microsoft.OData.Edm/Csdl/CsdlReader.cs#L483

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[gathogojr]

Hi @quanterion. Thank you for your pull request contribution. Could you please add a test to confirm the behaviour resulting from your change?

[wachugamaina]

Do we have tests covering both parsed is true and false ?

[ElizabethOkerio]

@quanterion Add tests

[ElizabethOkerio]

Add tests