Bug 167511 [Block]NPE when using customized IStyleProcessor with Chart Generator and no Chart will be rendered
Use a customized IStyleProcessor with Generator.build() and the chart will not be rendered in UI.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/factory/Generator.java
qOrthogonalSeriesDefinition = sd.getQuery( );
				if ( qOrthogonalSeriesDefinition == null )
				{
					continue;
				}
				sExpression = qOrthogonalSeriesDefinition.getDefinition( );
				if ( sExpression != null && sExpression.trim( ).length( ) > 0 )
				{
					
					if ( alExpressions.contains( sExpression ) )
					{
						int iRemovalIndex = alExpressions.indexOf( sExpression );
						if ( iRemovalIndex > iCount )
						{
							alExpressions.remove( iRemovalIndex );
							alExpressions.add( iCount++, sExpression );
						}
						else
						{
							
							
						}
					}
					else
					{
						
						alExpressions.add( iCount++, sExpression );
					}
				}
				seOrthogonal = sd.getDesignTimeSeries( );