goto implementation: when no implementations are possible (e.g. static method), include self into presentation

java/java-tests/testSrc/com/intellij/navigation/GotoImplementationHandlerTest.java

@@ -249,6 +249,18 @@ public class GotoImplementationHandlerTest extends JavaCodeInsightFixtureTestCas
     assertEquals("A", aClass.getName());
   }
 
+  public void testStaticMethodReference() {
+    PsiFile file = myFixture.addFileToProject("Foo.java",
+                                                          "class C {\n" +
+                                                          "  static void a(){}\n" +
+                                                          "  {a<caret>();}" +
+                                                          "}");
+    myFixture.configureFromExistingVirtualFile(file.getVirtualFile());
+
+    final PsiElement[] impls = getTargets(file);
+    assertEquals(1, impls.length);
+  }
+
   private PsiElement[] getTargets(PsiFile file) {
     GotoTargetHandler.GotoData gotoData = CodeInsightTestUtil.gotoImplementation(myFixture.getEditor(), file);
     assertNotNull(gotoData);

platform/lang-impl/src/com/intellij/codeInsight/navigation/ImplementationSearcher.java

@@ -149,7 +149,7 @@ public class ImplementationSearcher {
         return null;
       }
       PsiElement foundElement = result[0];
-      return foundElement != null ? new PsiElement[] {foundElement} : null;
+      return foundElement != null ? new PsiElement[] {foundElement} : PsiElement.EMPTY_ARRAY;
     }
 
     protected boolean canShowPopupWithOneItem(PsiElement element) {