add init for models without properties

pom.xml

@@ -5,7 +5,7 @@
     <artifactId>TINetworking-swagger-codegen</artifactId>
     <packaging>jar</packaging>
     <name>TINetworking-swagger-codegen</name>
-    <version>1.2.2</version>
+    <version>1.2.3</version>
     <build>
         <plugins>
             <plugin>

src/main/resources/handlebars/TINetworking/modelObject.mustache

@@ -79,6 +79,9 @@ public {{#useModelClasses}}class{{/useModelClasses}}{{^useModelClasses}}struct{{
         {{/allVars}}
     }
 {{/hasVars}}
+{{^hasVars}}
+    public init() {}
+{{/hasVars}}
 {{#additionalPropertiesType}}
     public var additionalProperties: [String:{{{additionalPropertiesType}}}] = [:]