KT-4980 'Remove braces' intention throws NPE for a for-loop with variable declaration

#KT-4980 fixed

idea/testData/intentions/removeBraces/forWithLocalVariable.kt

@@ -0,0 +1,5 @@
+fun foo(a: List<Int>) {
+    for<caret> (x in a) {
+        val y = x
+    }
+}