Introduce "Redundant else in if" inspection #KT-19668 Fixed

idea/testData/inspectionsLocal/redundantElseInIf/empty.kt

@@ -0,0 +1,14 @@
+// PROBLEM: none
+// WITH_RUNTIME
+class SomeException : RuntimeException()
+fun foo(): Int = 1
+
+fun test(x: Boolean, y: Boolean) {
+    if (x) {
+        throw SomeException()
+    } else if (y) {
+        // empty
+    } else<caret> {
+        foo()
+    }
+}