fix: fixed filtering on non-existing values not throwing an error, fixes

 #374

trying to filter on a non-existing field will now throw an exception, in case of inconsistent source data "has('propertyname')" and "get('propertyname')" can be used as workaround

fcli-core/fcli-common/src/main/java/org/springframework/integration/json/JsonPropertyAccessor.java

@@ -84,7 +84,7 @@ public boolean canRead(EvaluationContext context, Object target, String name) th
 		if (node instanceof ArrayNode) {
 			return index != null;
 		}
-		return true;
+		return node.has(name);
 	}
 
 	private JsonNode asJson(Object target) throws AccessException {