Creating self-closing tag when annotation arguments list is not null, but empty. Added test.

java/java-impl/src/com/intellij/codeInsight/ExternalAnnotationsManagerImpl.java

@@ -607,7 +607,7 @@ public class ExternalAnnotationsManagerImpl extends BaseExternalAnnotationsManag
   @NotNull
   private static String createAnnotationTag(@NotNull String annotationFQName, @Nullable PsiNameValuePair[] values) {
     @NonNls String text;
-    if (values != null) {
+    if (values != null && values.length != 0) {
       text = "  <annotation name=\'" + annotationFQName + "\'>\n";
       text += StringUtil.join(values, new Function<PsiNameValuePair, String>() {
         @NonNls

java/java-tests/testData/codeInsight/externalAnnotations/content/anno/p/annotationsAnnotateLibrary_after.xml

@@ -0,0 +1,11 @@
+<root>
+  <item name='p.TestDeannotation java.lang.String get()'>
+    <annotation name='org.jetbrains.annotations.NotNull'/>
+  </item>
+  <item name='p.TestDeannotation1 java.lang.String get(java.lang.String) 0'>
+    <annotation name='org.jetbrains.annotations.NotNull'/>
+  </item>
+    <item name='p.Test java.lang.String get()'>
+        <annotation name='org.jetbrains.annotations.NotNull'/>
+    </item>
+</root>

java/java-tests/testSrc/com/intellij/codeInsight/AddAnnotationFixTest.java

@@ -106,6 +106,8 @@ public class AddAnnotationFixTest extends UsefulTestCase {
     final PsiModifierListOwner listOwner = PsiTreeUtil.getParentOfType(psiElement, PsiModifierListOwner.class);
     assertNotNull(listOwner);
     assertNotNull(ExternalAnnotationsManager.getInstance(project).findExternalAnnotation(listOwner, AnnotationUtil.NOT_NULL));
+
+    myFixture.checkResultByFile("content/anno/p/annotations.xml", "content/anno/p/annotationsAnnotateLibrary_after.xml", false);
   }
 
   public void testPrimitive() throws Throwable {