Bug fix, the parameters, variables, resources may be null (#3176)

Author: zmssp

Utils/azure-explorer-common/src/com/microsoft/tooling/msservices/serviceexplorer/azure/arm/deployments/DeploymentPropertyViewPresenter.java

@@ -46,21 +46,26 @@ public void onLoadProperty(DeploymentNode node) {
             DeploymentExportResult template = deployment.exportTemplate();
             Map<String, Object> templateObj = (Map<String, Object>) template.template();
 
-
-            Map<String, Map<String, String>> parametersTmp = (Map<String, Map<String, String>>) templateObj.get("parameters");
-            for (String parameter : parametersTmp.keySet()) {
-                parameters.add(String.format("%s(%s)", parameter, parametersTmp.get(parameter).get("type")));
+            if (templateObj.get("parameters") != null) {
+                Map<String, Map<String, String>> parametersTmp = (Map<String, Map<String, String>>) templateObj.get("parameters");
+                for (String parameter : parametersTmp.keySet()) {
+                    parameters.add(String.format("%s(%s)", parameter, parametersTmp.get(parameter).get("type")));
+                }
             }
 
-            Map<String, Map<String, String>> variablesTmp = (Map<String, Map<String, String>>) templateObj.get("variables");
-            for (String variable : variablesTmp.keySet()) {
-                variables.add(variable);
-            }
-            List<Map<String, String>> resourcesTmp = (List<Map<String, String>>) templateObj.get("resources");
-            for (Map<String, String> resource : resourcesTmp) {
-                resources.add(String.format("%s(%s)", resource.get("name"), resource.get("type")));
+            if (templateObj.get("variables") != null) {
+                Map<String, Map<String, String>> variablesTmp = (Map<String, Map<String, String>>) templateObj.get("variables");
+                for (String variable : variablesTmp.keySet()) {
+                    variables.add(variable);
+                }
             }
 
+            if (templateObj.get("resources") != null) {
+                List<Map<String, String>> resourcesTmp = (List<Map<String, String>>) templateObj.get("resources");
+                for (Map<String, String> resource : resourcesTmp) {
+                    resources.add(String.format("%s(%s)", resource.get("name"), resource.get("type")));
+                }
+            }
             return new DeploymentProperty(deployment, parameters, variables, resources, template.templateAsJson());
         }).subscribeOn(this.getSchedulerProvider().io()).subscribe((property) -> {
             DefaultLoader.getIdeHelper().invokeLater(() -> {