Bug 182673 No default value error message prompts incorrectly
Steps to reproduce: 1. New a report parameter; 2. Choose control type as Combo; 3. Choose parameter as dynamic type; Expected result: As the isRequired is false by default, parameter's default value can be null value. There should be no error message about no default value prompt. Actual result; Error messages prompts
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ParameterDialog.java
}
		if ( DesignChoiceConstants.PARAM_TYPE_DATETIME.equals( getSelectedDataType( ) ) )
		{
			if ( defaultValueChooser != null
					&& ( !defaultValueChooser.isDisposed( ) )
					&& defaultValueChooser.getText( ).length( ) != 0 )
			{
				try
				{
					getValue( defaultValueChooser.getText( ) );
				}
				catch ( BirtException e )
				{
					return ERROR_MSG_MISMATCH_DATA_TYPE;
				}
			}
		}
		return null;
	}
	private void refreshValueTable( )
	{
		if ( valueTable != null && !valueTable.getTable( ).isDisposed( ) )
		{
			valueTable.refresh( );
			updateTableButtons( );
		}
	}
	private boolean getProperty( String key )
	{
		return ( (Boolean) dirtyProperties.get( key ) ).booleanValue( );