anchor.diff:      $('input-body').appendChild(row)
       registerDraggablesAndDroppables()
       showEmptyMessage()
  +
  +    //displaying the very fist empty column, that is not shown when no activities is present
  +    if (currentActivityCount() > 0) {
  +        var td1Element = document.getElementById("td1")
  +        var td2Element = document.getElementById("td2")
  +
  +        td1Element.style.display = 'table-cell';
  +        td2Element.style.display = 'table-cell';
  +    }
       SC.slideAndShow(rowId)
   }
   
  
positive.code:         <form:form>
              <c:set var="tableWidth" value="${period.duration.days + 2}"/>
              <table>
                  <tr>
                      <td></td>
                      <th colspan="${tableWidth - 2}">Days of arm (${commons:pluralize(period.repetitions, "repetition")})</th>
                      <td></td>
                      <td id="emptyCellNoWidth"> </td>
                  </tr>
                  <tr id="days-header">
                      <td></td>
                      <c:forEach items="${period.dayRanges[0].days}" var="d">
                          <th id="day-number" class="day-number">
                              <c:forEach begin="0" end="${period.repetitions - 1}" var="x" varStatus="xStatus">
  
negative.code:     }
  
      .input-row td input {
          /*border-width: 0; border-bottom: 1px dotted #666;*/
          border-width: 0; border-bottom: 1px #666;
          text-align: center;
          padding: 2px;
      }
  