title: Remove file before pollEnrich will end the strategy
body: <p>If I delete file before when route will process exchange I get exception:
  GenericFileOperationFailedException: Cannot rename file. PollEnrich's strategy trying to move file from someFolder to someFolder/.camel.</p>
  
  <pre><code>from("wmq:queue:someQueue")//Here we get the message with information about the file
  ...//some logic
  .pollEnrich("file:someFolder?fileName=someFile")
  ...//some logic
  .choice()
      .when(...)//Here we compare checksum from message with checksum of the file
      .process(new SomeClassProcess)//And if they are different file will be deleted from someFolder
      .otherwise()
      .to(someAnotherFolder)
  .end();    
  </code></pre>
  
  <p>I'm trying to use .rollback("errorMessage")</p>
  
  <pre><code>onException(RollbackExchangeException.class)
  .log(LoggingLevel.WARN, "SomeExcptn");
  
  from("wmq:queue:someQueue")
      ...//some logic
      .pollEnrich("file:someFolder?fileName=someFile")
      ...//some logic
      .choice()
          .when(...)
          .process(new SomeClassProcess)//it will delete someFile from someFolder
          .rollback()
          .otherwise()
          .to(someAnotherFolder)
      .end();
  </code></pre>
  
  <p>But now I got garbage in application's logs - CamelExecutionException.
  It works, but could you help solve it anower way?</p>
  
  <p>P.S. I don't know do I need to delete file before I will provide URI to pollEnrich, thats why I don't use noop=true. In .otherwise() I need move file to .camel.</p>
  
  <p>Thanks in advice!</p>