Java: Fixed the intention "Invert 'if' condition" in the case of nested 'if' without braces (IDEA-167957)

java/java-tests/testData/codeInsight/invertIfCondition/beforeNestedIf3.java

@@ -0,0 +1,10 @@
+// "Invert 'if' condition" "true"
+class Main {
+    boolean method(boolean a, boolean b) {
+        if (a)
+            <caret>if (!b)
+                return true; // comment
+        int x = 1;
+        return false;
+    }
+}