added MissingVMTopologyException

commons/src/main/java/nl/uva/sne/drip/commons/utils/ToscaHelper.java

@@ -119,8 +119,16 @@ public class ToscaHelper {
     }
 
     public List<NodeTemplateMap> getVMTopologyTemplates() throws ApiException {
+
+        try {
             List<NodeTemplateMap> vmTopologyTemplates = api.getNodeTemplates(String.valueOf(id), "tosca.nodes.ARTICONF.VM.topology", null, null, null, null, null, null, null);
             return vmTopologyTemplates;
+        } catch (ApiException ex) {
+            if (ex.getCode() == 404) {
+                return null;
+            }
+            throw ex;
+        }
     }
 
     public List<NodeTemplateMap> getTemplateVMsForVMTopology(NodeTemplateMap nodeTemplateMap) throws ApiException {

commons/src/main/java/nl/uva/sne/drip/model/Exceptions/MissingVMTopologyException.java

+/*
+ * Copyright 2020 S. Koulouzis
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package nl.uva.sne.drip.model.Exceptions;
+
+/**
+ *
+ * @author S. Koulouzis
+ */
+public class MissingVMTopologyException extends Exception {
+
+    public MissingVMTopologyException(String string) {
+        super(string);
+    }
+}