Generate multi-files facade even if it's empty

It still contains useful information about it's parts,
that may be used while building stubs for multi-file group
containing only InlineOnly functions

compiler/tests/org/jetbrains/kotlin/codegen/BytecodeListingTestGenerated.java

@@ -41,6 +41,12 @@ public class BytecodeListingTestGenerated extends AbstractBytecodeListingTest {
         doTest(fileName);
     }
 
+    @TestMetadata("emptyMultifileFacade.kt")
+    public void testEmptyMultifileFacade() throws Exception {
+        String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/bytecodeListing/emptyMultifileFacade.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("inlineOnly.kt")
     public void testInlineOnly() throws Exception {
         String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/bytecodeListing/inlineOnly.kt");