IJPL-148490 exclude empty file-classes from API

GitOrigin-RevId: d0bdb06e75377c439bb5c83863ffcc596db9e55a

tools/apiDump/src/impl.kt

@@ -190,6 +190,9 @@ class ApiIndex {
             ApiFlags(memberSignature.access.access, memberSignature.annotations.isExperimental() || companionAnnotations.isExperimental),
           )
         }
+      if (members.isEmpty() && signature.isNotUsedWhenEmpty) {
+        continue
+      }
       result += ApiClass(
         className,
         flags = ApiFlags(signature.access.access, signature.annotations.isExperimental()),

tools/apiDump/testData/src/ktFileWithInternalMembers.kt

@@ -0,0 +1,12 @@
+@file:Suppress("unused")
+
+package com.intellij.tools.apiDump.testData
+
+import org.jetbrains.annotations.ApiStatus.Internal
+
+@Internal
+fun apiInternalFunction() {
+}
+
+@Internal
+val apiInternalProperty: Unit = Unit