Test for KT-2619

Remove outdated check in WhenChecker

# KT-2619 fixed

compiler/testData/diagnostics/tests/j+k/kt2619.kt

@@ -0,0 +1,15 @@
+//FILE: foo.kt
+fun main(args: Array<String>) {
+    val c: Type
+    <!NO_ELSE_IN_WHEN!>when<!> (<!UNINITIALIZED_VARIABLE!>c<!>)  {
+
+    }
+}
+
+
+
+//FILE: Type.java
+public enum Type {
+    TYPE,
+    NO_TYPE;
+}