moved changes to updated file and the removed miss located one

Author: HugoMario

modules/swagger-codegen/src/main/java/io/swagger/codegen/utils/ModelUtils.java

@@ -12,6 +12,9 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
 public class ModelUtils {
     /**
@@ -43,15 +46,18 @@ public static CodegenModel getModelByName(final String name, final Map<String, O
     }
 
     public static Operation[] createOperationArray (PathItem pathItem) {
-        return new Operation[]{
+        return Stream.of(
                 pathItem.getGet(),
                 pathItem.getPost(),
                 pathItem.getDelete(),
                 pathItem.getHead(),
                 pathItem.getPut(),
                 pathItem.getPatch(),
                 pathItem.getOptions()
-        };
+        )
+                .filter(Objects::nonNull)
+                .collect(Collectors.toSet())
+                .toArray(new Operation[]{});
     }
 
     public static void processCodegenModels(Map<String, CodegenModel> allModels) {