Add test for obsolete issue

#KT-4434 Obsolete

compiler/testData/diagnostics/tests/when/kt4434.kt

@@ -0,0 +1,27 @@
+// KT-4434 Missed diagnostic about else branch in when
+
+package test
+
+fun foo(): Int {
+    val a = "a"
+    return if (a.length() > 0) {
+        <!NO_ELSE_IN_WHEN!>when<!> (a) {
+            "a" -> 1
+        }
+    }
+    else {
+        3
+    }
+}
+
+fun bar(): Int {
+    val a = "a"
+    if (a.length() > 0) {
+        return <!NO_ELSE_IN_WHEN!>when<!> (a) {
+            "a" -> 1
+        }
+    }
+    else {
+        return 3
+    }
+}

compiler/testData/diagnostics/tests/when/kt4434.txt

@@ -0,0 +1,6 @@
+package
+
+package test {
+    internal fun bar(): kotlin.Int
+    internal fun foo(): kotlin.Int
+}