Bug 156658 Error occour when previewing a text with a style set word-spacing 20cm in PDF
Description: Error occour when previewing a text with a style set word-spacing 20cm Steps to reproduce: 1.new a text and input some text like "actuate great" 2.new a style and set word-spacing 20cm then apply it to the text 3.Preview in PDF Expected: No error occour Actual: Error occour Error log: org.eclipse.birt.report.service.api.ReportServiceException: Error happened while running the report
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/pdf/PDFTextLM.java
{        
			if ( isInline )
			{
				return createInlineTextArea( text, content, fi, dimension );
			}
			else
			{
				return createBlockTextArea( text, content, fi, dimension );
			}
		}
		
		/**
		 * Gets the hyphenation index
		 * 
		 * @param startIndex			    the start index
		 * @param width						the width of the free space 
		 * @param hyphenation				the hyphenation
		 * @param fi						the FontInfo object of the text to be hyphened.
		 * @return 							the hyphenation index
		 */
		private int hyphen(int startIndex, int width,
				Hyphenation hyphenation, FontInfo fi) 
		{
			assert (startIndex >= 0);
			if (startIndex > hyphenation.length() - 1) 
			{
				return -1;
			}
			int last = 0;
			int current = 0;