Revert change in SchemaException handling

The change switched SchemaException in connectors from FATAL to
PARTIAL, but also silenced SchemaException occurring in the model.
Tests like TestPreviewChanges and TestMapping then failed, as they
didn't get expected SchemaException's.

So reverting that change now.

model/model-impl/src/main/java/com/evolveum/midpoint/model/impl/util/Utils.java

@@ -674,7 +674,7 @@ public static void handleConnectorErrorCriticality(ResourceType resourceType, Th
 		} else {
 			ErrorSelectorType errorSelector = ResourceTypeUtil.getConnectorErrorCriticality(resourceType);
 			if (errorSelector == null) {
-				if (e instanceof CommunicationException || e instanceof SchemaException) {
+				if (e instanceof CommunicationException) {
 					// Just continue evaluation. The error is recorded in the result.
 					// The consistency mechanism has (most likely) already done the best.
 					// We cannot do any better.