[Spec tests] Link diagnostic tests for when expression with Kotlin specification

compiler/tests-spec/testData/diagnostics/linked/declarations/classifier-declaration/classifier-initialization/testsMap.json

@@ -0,0 +1,15 @@
+{
+  "6": {
+    "neg": {
+      "4": [
+        {
+          "specVersion": "0.1-155",
+          "casesNumber": 0,
+          "description": "Property not initialized",
+          "path": "compiler/testData/diagnostics/tests/when/PropertyNotInitialized.kt",
+          "unexpectedBehaviour": false
+        }
+      ]
+    }
+  }
+}