React native optionals fix

Author: abnegate

templates/react-native/src/services/template.ts.twig

@@ -50,7 +50,7 @@ export class {{ service.name | caseUcfirst }} extends Service {
     {%~ endif %}
      */
      {%~ if method.parameters.all|length > 0 %}
-    {% if method.type == 'upload'%}async {% endif %}{{ method.name | caseCamel }}{{ method.responseModel | getGenerics(spec) | raw }}(params?: { {% for parameter in method.parameters.all %}{{ parameter.name | caseCamel | escapeKeyword }}{% if not parameter.required or parameter.nullable %}?{% endif %}: {{ parameter | getPropertyType(method) | raw }}{% if not loop.last %}, {% endif %}{% endfor %} {% if 'multipart/form-data' in method.consumes %}, onProgress?: (progress: UploadProgress) => void{% endif %} }): {{ method | getReturn(spec) | raw }};
+    {% if method.type == 'upload'%}async {% endif %}{{ method.name | caseCamel }}{{ method.responseModel | getGenerics(spec) | raw }}(params{% set hasRequiredParams = false %}{% for parameter in method.parameters.all %}{% if parameter.required %}{% set hasRequiredParams = true %}{% endif %}{% endfor %}{% if not hasRequiredParams %}?{% endif %}: { {% for parameter in method.parameters.all %}{{ parameter.name | caseCamel | escapeKeyword }}{% if not parameter.required or parameter.nullable %}?{% endif %}: {{ parameter | getPropertyType(method) | raw }}{% if not loop.last %}, {% endif %}{% endfor %} {% if 'multipart/form-data' in method.consumes %}, onProgress?: (progress: UploadProgress) => void{% endif %} }): {{ method | getReturn(spec) | raw }};
     /**
      {%~ if method.description %}
      * {{ method.description | replace({'\n': '\n     * '}) | raw }}