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Why is this an issue?
Empty case clauses that fall through to the default are useless. Whether or not such a case is present, the
default clause will be invoked. Such cases simply clutter the code, and should be removed.
Noncompliant code example
switch(ch)
{
  case 'a' :
    HandleA();
    break;
  case 'b' :
    HandleB();
    break;
  case 'c' :  // Noncompliant
  default:
    HandleTheRest();
    break;
}

Compliant solution
switch(ch)
{
  case 'a' :
    HandleA();
    break;
  case 'b' :
    HandleB();
    break;
  default:
    HandleTheRest();
    break;
}