[java] Allow try-with-resources to be empty

* Fixes #432

pmd-java/src/main/resources/rulesets/java/empty.xml

@@ -129,7 +129,7 @@ Avoid empty try blocks - what's the point?
           <property name="xpath">
               <value>
 <![CDATA[
-//TryStatement/Block[1][count(*) = 0]
+//TryStatement[not(ResourceSpecification)]/Block[1][count(*) = 0]
 ]]>
               </value>
           </property>

pmd-java/src/test/resources/net/sourceforge/pmd/lang/java/rule/empty/xml/EmptyTryBlock.xml

@@ -46,6 +46,19 @@ public class EmptyTryBlock3 {
                        int x = 5;
                }
        }
+}
+     ]]></code>
+    </test-code>
+    <test-code>
+        <description>#432 false positive for empty try-with-resource</description>
+        <expected-problems>0</expected-problems>
+        <code><![CDATA[
+class X {
+	void method() {
+		try (ClientResponse response = execute(() -> target.request(mediaTypes).delete(), DELETE, new ExpectedResponse(status, required))) {
+			// false positive
+		}
+	}
 }
      ]]></code>
     </test-code>