fix(node): missing quotes

Author: TorstenDittmann

templates/web/src/sdk.ts.twig

@@ -180,7 +180,7 @@ class {{ spec.title | caseUcfirst }} {
         {{ method.name | caseCamel }}: {% if method.type != "location" and method.type != 'webAuth'%}async <T extends unknown>{% endif %}({% for parameter in method.parameters.all %}{{ parameter.name | caseCamel }}{% if not parameter.required %}?{% endif %}: {{ parameter.type | typeName }}{% if not loop.last %}, {% endif %}{% endfor %}): {% if method.type == 'webAuth' %}void | URL{% elseif method.type == 'location' %}URL{% else %}Promise<T>{% endif %} => {
 {% for parameter in method.parameters.all %}
 {% if parameter.required %}
-            if (typeof {{ parameter.name | caseCamel }} === undefined) {
+            if (typeof {{ parameter.name | caseCamel }} === 'undefined') {
                 throw new {{spec.title | caseUcfirst}}Exception('Missing required parameter: "{{ parameter.name | caseCamel }}"');
             }