Bug 313459 Problem with % when generating images in tables.
See the attached BirtProject, it has two reports. Each identical except for this difference: The image width/height is set to a %age value (50%) in one (TestImage.rptdesign) and not-set in the other (TestImageWorking.rptdesign). TestImage.rptdesign does not display the image in pdf, but works fine in html. TestImageWorking.rptdesign shows the image in both pdf and html. The %age setting seems to cause the problem in pdf format.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/pdf/util/PropertyUtil.java
catch ( IllegalArgumentException ex )
					{
						return null;
					}
				}
			}
		}
		return null;
	}
	static final Color hexToColor( String value )
	{
		String digits;
		if ( value.startsWith( "#" ) )
		{
			digits = value.substring( 1, Math.min( value.length( ), 7 ) );
		}
		else
		{
			digits = value;
		}
		String hstr = "0x" + digits;
		Color c;
		try
		{
			c = Color.decode( hstr );
		}
		catch ( NumberFormatException nfe )
		{
			c = null;
		}