add getHasExamples() method to support {{hasExamples}} tag in templates

modules/swagger-codegen/src/main/java/io/swagger/codegen/CodegenOperation.java

@@ -42,7 +42,7 @@ public class CodegenOperation {
      *
      * @return true if parameter exists, false otherwise
      */
-    private static boolean nonempty(List<CodegenParameter> params) {
+    private static boolean nonempty(List<?> params) {
         return params != null && params.size() > 0;
     }
     
@@ -91,6 +91,15 @@ public class CodegenOperation {
         return nonempty(formParams);
     }
 
+    /**
+     * Check if there's at least one example parameter
+     *
+     * @return true if examples parameter exists, false otherwise
+     */
+    public boolean getHasExamples() {
+        return nonempty(examples);
+    }
+
     /**
      * Check if act as Restful index method
      *