Bug 156166 Error occour when previewing attached report in web viewer.
Decription:Error occour when previewing attached report in web viewer. Steps to reproduce: 1.run attached reports in web viewer. Expeceted results: preview properly Actual results: Error occour when previewing the reports in web viewer while it works properly in html and PDF
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/BindingColumnsEvalUtil.java
for ( int i = 0; i < resultClass.getFieldCount( ); i++ )
					columnNameSet.add( resultClass.getFieldName( i + 1 ) );
			}
			catch ( DataException e )
			{
				
			}
		}
		
		/**
		 * @param columnName
		 * @return
		 */
		private boolean contains( String columnName )
		{
			return columnNameSet.contains( columnName );
		}
		
		/**
		 * @param columnName
		 * @return
		 * @throws DataException
		 */
		private Object getValue( String columnName ) throws DataException
		{
			return ri.getCurrentResult( ).getFieldValue( columnName );
		}
	}
}