Ignore method without return value for property annotation.

PiperOrigin-RevId: 702828504

Author: j2objc-copybara

translator/src/main/java/com/google/devtools/j2objc/translate/Rewriter.java

@@ -272,6 +272,7 @@ public void endVisit(PropertyAnnotation node) {
         MethodDeclaration method = (MethodDeclaration) body;
         if (method.getParameters().isEmpty()
             && !method.isConstructor()
+            && !TypeUtil.isVoid(method.getReturnTypeMirror())
             && !ElementUtil.hasAnnotation(method.getExecutableElement(), Property.Suppress.class)) {
           method.setIsPseudoProperty(true);
         }

translator/src/test/java/com/google/devtools/j2objc/gen/ObjectiveCHeaderGeneratorTest.java

@@ -887,6 +887,18 @@ public void testPropertiesOfGetTypesWithSettersNullable() throws IOException {
             + " NSString * fooField;");
   }
 
+  public void testPropertyAnnotationIgnoresVoidMethod() throws IOException {
+    String sourceContent =
+        "  import com.google.j2objc.annotations.Property;"
+            + "@Property "
+            + "public class FooBar {"
+            + "  public void doFoo() {}"
+            + "  "
+            + "}";
+    String translation = translateSourceFile(sourceContent, "FooBar", "FooBar.h");
+    assertNotInTranslation(translation, "@property");
+  }
+
   public void testPropertiesOfClassTypes() throws IOException {
     String sourceContent =
         "  import com.google.j2objc.annotations.Property;"