IDEA-136406 Complete current statement doesn't insert a method body for default methods, creates broken code

java/java-tests/testData/codeInsight/completeStatement/DefaultMethodBody.java

@@ -0,0 +1,3 @@
+public interface Foo {
+    default void foo(<caret>)
+}

java/java-tests/testData/codeInsight/completeStatement/DefaultMethodBody_after.java

@@ -0,0 +1,5 @@
+public interface Foo {
+    default void foo() {
+        <caret>
+    }
+}