Disable add service button if service name is empty (#3480)

dashboard/src/main/home/app-dashboard/new-app-flow/Services.tsx

@@ -175,7 +175,7 @@ const Services: React.FC<ServicesProps> = ({
               setServiceName("");
               setServiceType("web");
             }}
-            disabled={maybeGetError() != null}
+            disabled={maybeGetError() != null || serviceName == ""}
           >
             <I className="material-icons">add</I> Add service
           </Button>