message: fix(SelectionList): correctly handle null values
diff: @@ -653,7 +653,7 @@ export class TsSelectionListComponent implements
  const controlValue = this.ngControl.value;
  // If the input value doesn't match the selection, then the user must have edited the input value
  // istanbul ignore else
  - if (inputValue !== ((controlValue && controlValue.length > 0) ? this.displayFormatter(controlValue[0]) : '')) {
  + if (controlValue && inputValue !== ((controlValue && controlValue.length > 0) ? this.displayFormatter(controlValue[0]) : '')) {
  this.ngControl.value.length = 0;
  }
  }
  