added empty var check

src/main/java/com/wordnik/swagger/codegen/CodegenModel.java

@@ -11,4 +11,5 @@ public class CodegenModel {
   public String defaultValue;
   public List<CodegenProperty> vars = new ArrayList<CodegenProperty>();
   public Set<String> imports = new HashSet<String>();
+  public Boolean hasVars, emptyVars;
 }

src/main/java/com/wordnik/swagger/codegen/DefaultCodegen.java

@@ -353,7 +353,8 @@ public class DefaultCodegen {
           m.imports.add(containerType);
         }
       }
-      if(impl.getProperties() != null) {
+      if(impl.getProperties() != null && impl.getProperties().size() > 0) {
+        m.hasVars = true;
         for(String key: impl.getProperties().keySet()) {
           Property prop = impl.getProperties().get(key);
 
@@ -396,6 +397,9 @@ public class DefaultCodegen {
           }
         }
       }
+      else {
+        m.emptyVars = true;
+      }
     }
     return m;
   }

src/main/resources/objc/model-body.mustache

@@ -3,15 +3,16 @@
 #import "SWGDate.h"
 #import "{{classname}}.h"
 
-@implementation {{classname}}
+@implementation {{classname}}{{#parent}}: {{parent}}{{/parent}}
 
+{{#hasVars}}
 -(id){{#vars}}{{name}}: ({{datatype}}) {{name}}{{^hasMore}} { {{/hasMore}}
     {{/vars}}
     {{#vars}}_{{name}} = {{name}};
     {{/vars}}
     return self;
 }
-
+{{/hasVars}}
 -(id) initWithValues:(NSDictionary*)dict
 {
     self = [super init];

src/main/resources/objc/model-header.mustache

@@ -11,10 +11,11 @@
 {{#vars}}
 @property(nonatomic) {{datatype}} {{name}};  {{#description}}/* {{{description}}} {{#isNotRequired}}[optional]{{/isNotRequired}} */{{/description}}{{newline}}
 {{/vars}}
+{{#hasVars}}
 - (id) {{#vars}}{{name}}: ({{datatype}}) {{name}}{{#hasMore}}
   {{/hasMore}}{{^hasMore}};{{/hasMore}}
        {{/vars}}
-{{newline}}
+{{/hasVars}}
 - (id) initWithValues: (NSDictionary*)dict;
 - (NSDictionary*) asDictionary;
 {{newline}}