Handle classes with no members and semi-colons

PiperOrigin-RevId: 638312117

Author: cushon

core/src/main/java/com/google/googlejavaformat/java/JavaInputAstVisitor.java

@@ -3744,6 +3744,12 @@ protected void addBodyDeclarations(
         tokenBreakTrailingComment("{", plusTwo);
         builder.blankLineWanted(BlankLineWanted.NO);
         builder.open(ZERO);
+        if (builder.peekToken().equals(Optional.of(";"))) {
+          builder.open(plusTwo);
+          dropEmptyDeclarations();
+          builder.close();
+          builder.forcedBreak();
+        }
         token("}", plusTwo);
         builder.close();
       }

core/src/test/resources/com/google/googlejavaformat/java/testdata/SemicolonInClass.input

@@ -0,0 +1,3 @@
+class SemicolonInClass {
+  ;
+}

core/src/test/resources/com/google/googlejavaformat/java/testdata/SemicolonInClass.output

@@ -0,0 +1,3 @@
+class SemicolonInClass {
+  ;
+}