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
if ( newStyle.getFont( ) != null )
				{
					currentStyle.setFont( FontDefinitionImpl.copyInstance( newStyle.getFont( ) ) );
				}
			}
			else if ( newStyle.getFont( ) != null )
			{
				FontDefinition fd = currentStyle.getFont( );
				FontDefinition newFd = FontDefinitionImpl.copyInstance( newStyle.getFont( ) );
				ChartUtil.mergeFont( fd, newFd );
			}
			if ( currentStyle.getColor( ) == null
					&& newStyle.getColor( ) != null )
			{
				currentStyle.setColor( ColorDefinitionImpl.copyInstance( newStyle.getColor( ) ) );
			}
		}
		
		FontDefinition fd = currentStyle.getFont( );
		if ( fd != null
				&& fd.getName( ) != null
				&& fd.isSetSize( )
				&& fd.isSetBold( )
				&& fd.isSetItalic( )
				&& fd.isSetRotation( )
				&& fd.isSetWordWrap( )
				&& fd.isSetUnderline( )
				&& fd.isSetStrikethrough( )
				&& fd.getAlignment( ) != null
				&& fd.getAlignment( ).isSetHorizontalAlignment( )