Nothing like the visit of a lower-league club to help the Chelsea storm pass, or at least to provide a break from the rain. Chelsea were feeling sorry for themselves, but they are heading to Wembley now for a cup semi-final after a ruthless display of goalscoring pomp which lifted the mood and ensured smiles could return to the club. The question is for how long. Upset emphatically avoided How they needed that. More than about setting up a date with Wembley and an FA Cup semi-final as silverware potentially draws closer, this was about turning a page and stopping the rot. The last time Port Vale and Chelsea faced off was in April 1929. The Valiants won 1-0. If anything could be gleaned from a match that took place 97 years ago to the month, it was that keeping focus would be key if slipping on this potential banana skin was to be avoided. The visitors had shown spirit by beating Sunderland and Bristol City during an impressive cup run in which they have …