Fix writing traces with dynamically-defined PCs

ItemType couldn't be created for PrismContainers with no compile time
class, as .getRealValues() obviously cannot be executed.

TODO This situation probably occurs at more places in the code. Review.

infra/prism-api/src/main/java/com/evolveum/prism/xml/ns/_public/types_3/ItemType.java

@@ -94,11 +94,18 @@ public String toString() {
                 '}';
     }
 
-    public static ItemType fromItem(Item item) {
+    public static ItemType fromItem(Item<?, ?> item) {
         if (item != null) {
             ItemType rv = new ItemType();
             rv.setName(item.getElementName());
-            rv.value.addAll(item.getRealValues());
+            if (item instanceof PrismContainer && (item.getDefinition() == null || ((PrismContainerDefinition) item.getDefinition()).getCompileTimeClass() == null)) {
+                // a special case -- item.getRealValues() does not work here (TODO generalize this)
+                for (PrismContainerValue<?> value : ((PrismContainer<?>) item).getValues()) {
+                    rv.value.add(new RawType(value, null, item.getPrismContext()));
+                }
+            } else {
+                rv.value.addAll(item.getRealValues());
+            }
             return rv;
         } else {
             return null;