Handle null values gracefully in parseExtension #6797
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`parseChildren` `parseAlternates` and `parseExtension` all invoke `parseExtension` after `grabJsonArray`. `grabJsonArray` may return a null value in the case of a JSON null (`object.isNull()`). Some JSON serializers tend to put `"extension": null` rather than leaving out `"extension"` in certain cases, and this makes sure our deserializer handles those inputs gracefully.
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parseChildrenparseAlternatesandparseExtensionall invokeparseExtensionaftergrabJsonArray.grabJsonArraymay return a null value in the case of a JSON null (object.isNull()). Some JSON serializers tend to put"extension": nullrather than leaving out"extension"in certain cases. This change makes sure our deserializer handles those inputs gracefully. (Currently, it throws aNullPointerExceptionfrom within the parser at thetheValues.size()call.)