Not show error message when the region of IoT Hub does not support PnP (#359)

* Not show error message when IoT Hub does not support PnP

* Add preview label

src/Nodes/InterfaceLabelNode.ts

@@ -18,7 +18,7 @@ export class InterfaceLabelNode implements INode {
 
     public getTreeItem(): vscode.TreeItem {
         return {
-            label: "Interfaces",
+            label: "Interfaces (Preview)",
             collapsibleState: vscode.TreeItemCollapsibleState.Collapsed,
             contextValue: "interfaces-label",
         };
@@ -40,6 +40,9 @@ export class InterfaceLabelNode implements INode {
             return Object.keys(interfaces.interfaces).map((name) => new InterfaceNode(name, context.asAbsolutePath(path.join("resources", `interface.svg`))));
         } catch (err) {
             TelemetryClient.sendEvent(Constants.IoTHubAILoadInterfacesTreeDoneEvent, { Result: "Fail", Message: err.message });
+            if (err.response && err.response.status === 400) {
+                return [];
+            }
             return Utility.getErrorMessageTreeItems("interfaces", err.message);
         }
     }