title: Springfox swagger-ui endpoint duplicate when using tag
body: <p>In my spring-boot project with springfox swagger 2.9.2, I have controller annotated with RestController</p>
  
  <pre><code>@RestController
  @RequestMapping("/rest/api/v1/auth")
  public class AuthenticationResource {
  
      @ApiOperation(value = "Authenticate user", tags = {"Authentication"})
      @PostMapping("login")
      public void login(@RequestBody @Valid LoginDto loginDto) {
          ...
      }
  }
  </code></pre>
  
  <p>After I've added tags to ApiOperation, I got duplicated endpoint in swagger-ui.
  I have empty authentication-resource without any endpoints and Authentication resource with login endpoint.</p>
  
  <p><a href="https://i.stack.imgur.com/tRwb1.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/tRwb1.png" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/kSq0D.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/kSq0D.png" alt="enter image description here"></a></p>
  
  <p>This didn't happen in older swagger versions.
  How can I remove empty api from swagger-ui?</p>
  
  <p>Thanks</p>