module-info.java in compilation source causes IllegalStateException

[sandwwraith]

Reproducer: Kotlin/kotlinx.serialization#1624
Exception:

Caused by: java.lang.IllegalStateException: superName must not be null
        at kotlinx.validation.api.KotlinSignaturesLoadingKt$loadApiFromJvmClasses$4.invoke(KotlinSignaturesLoading.kt:56)
        at kotlinx.validation.api.KotlinSignaturesLoadingKt$loadApiFromJvmClasses$4.invoke(KotlinSignaturesLoading.kt)
        at kotlin.sequences.TransformingSequence$iterator$1.next(Sequences.kt:172)
        at kotlin.collections.CollectionsKt___CollectionsKt.toCollection(_Collections.kt:1206)
        at kotlin.collections.CollectionsKt___CollectionsKt.toMutableList(_Collections.kt:1239)
        at kotlin.collections.CollectionsKt___CollectionsKt.sortedWith(_Collections.kt:988)
        at kotlinx.validation.api.KotlinSignaturesLoadingKt.loadApiFromJvmClasses(KotlinSignaturesLoading.kt:162)
        at kotlinx.validation.api.KotlinSignaturesLoadingKt.loadApiFromJvmClasses$default(KotlinSignaturesLoading.kt:20)
        at kotlinx.validation.KotlinApiBuildTask.generate(KotlinApiBuildTask.kt:49)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:104)
        at org.gradle.api.internal.project.taskfactory.StandardTaskAction.doExecute(StandardTaskAction.java:58)

Cause:
https://github.com/Kotlin/binary-compatibility-validator/blob/master/src/main/kotlin/api/KotlinSignaturesLoading.kt#L41
superName is null for module-info class. ASM and validator do not expect that.
Possible solutions: make superName nullable or just filter out such classes.

Note that visibilityFilter is actually not used anywhere, filtering by fq name (ignoredClasses) happens after loading ASM.

[qwwdfsad]

Fixed in 0.7.1