Fix combining class and method level @CrossOrigin attributes [SPR-13097]

[spring-projects-issues]

Sébastien Deleuze opened SPR-13097 and commented

Fix combining class and method level @CrossOrigin attributes by keeping current behavior (no origin defined = * for example) but using empty string and empty arrays default values in @CrossOrigin in order to be able to detect if an attribute has been explicitly set by the user or not.

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Affects: 4.2 RC1