Java: Add braces when extracting method from then/else branch or loop body (IDEA-181096)

java/java-tests/testData/refactoring/extractMethod/ExtractBareElseBranch.java

@@ -0,0 +1,14 @@
+class ElseIf {
+    String foo(boolean a, boolean b) {
+        if (a) {
+
+        } else <selection>if (b) {
+            String s = bar();
+            if (s != null) return s;
+        }</selection>
+
+        return null;
+    }
+
+    String bar() { return "";}
+}