Bug 120216 Group dialog should be showed even dataset is not set.
- Add a table report item - do not set the data set - try creating a new table group. - An error is shown Expected behavior - As part of the template requirements, we dont want UI to do the validation. User should be able to go and define a group, even if the dataset is not defined.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/GroupDialog.java
inputGroup.clearContents( GroupHandle.FOOTER_SLOT );
					}
				}
			}
			if ( ascending.getSelection( ) )
			{
				inputGroup.setSortDirection( DesignChoiceConstants.SORT_DIRECTION_ASC );
			}
			else
			{
				inputGroup.setSortDirection( DesignChoiceConstants.SORT_DIRECTION_DESC );
			}
			
			inputGroup.setTocExpression( UIUtil.convertToModelString( tocEditor.getText( ),
					true ) );
		}
		catch ( SemanticException e )
		{
			ExceptionHandler.handle( e );
			return;
		}
		setResult( inputGroup );
		super.okPressed( );
	}
	/**
	 * Returns the internal type index by its value.
	 * 
	 * @param interval
	 */
	private int getIntervalTypeIndex( String interval )