Page.empty() is still broken

[eahrold]

Expected Behavior

an empty page should still be mappable.

    void "Empty Page Can be mapped Mapped"() {
        when:
        Page<String> page = Page.empty()
        def copy = page.map { it -> it }
        copy.getTotalSize()

        then:
        notThrown(Throwable.class)
    }

Actual Behaviour

It seems like some toes were dipped in the water around this issue
https://github.com/micronaut-projects/micronaut-data/pull/3142/files

but I'm guessing there's some additional context as to why it's set to null rather than 0.

micronaut-data/data-model/src/main/java/io/micronaut/data/model/Page.java

Line 100 in 833e04b

return new DefaultPage<>(content, getPageable(), hasTotalSize() ? getTotalSize() : null);

    void "Broken Empty Page When Mapped"() {
        when:
        Page<String> page = Page.empty()
        def copy = page.map { it -> it }
        copy.getTotalSize()

        then:
        thrown(java.lang.IllegalStateException.class)
    }

Caused by: java.lang.IllegalStateException: Page does not contain total count. It is likely that the Pageable needs to be modified to request this information.

Steps To Reproduce

test code provided above

Environment Information

any

Example Application

No response

Version

Micronaut Data 4.9.4