[ALOY-1080] Compiler fails with misleading message when dataCollection set on ListView rather than ListSection

If the dataCollection attribute is set on the ListView, as shown below, the Alloy compiler fails with the message that the ItemTemplate must have a name attribute (which it does in the example).

<Alloy>
  <Collection src="mycollection"/>
  <Window id="win">
    <ListView id="thelist" defaultItemTemplate="listTemplate" dataCollection="mycollection">
      <Templates>
        <ItemTemplate name="listTemplate">
          <Label bindId="mylabel" id="mylabel"/>
        </ItemTemplate>
      </Templates>
      <ListSection id="mainsection">
      </ListSection>
    </ListView>
  </Window>
</Alloy>

Moving the dataCollection attribute to the ListSection tag resolves the issue. This might be primarily a documentation issue -- that the list section is what you bind to your collection. However, the error message should be more meaningful and accurate.