Bug 147407 Preview the attached report in the web viewer first time and then click the TOC button will cause NPE error
Description: It just can be reprouduced at first time preview. Step to reproduce: 1. please use attach report file 2. preview it in the web viewer 3. click the "Toggle table of contents" button Actual result: As the atteched screenshot shows,There is a NPE error.And if you preview it in the Web viewer again, the phenomenon is disappear.But reopen the eclipse and preview it at first time, it will be occured.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
}
			}
		}
		if ( name != null && name.length( ) > 0 ) 
		{
			if ( getParameter( request, name ) == null )
			{
				String paramValue = value;
				paramValue = urlEncode( paramValue, UTF_8_ENCODE );
				queryString += ( isFirst ? "" : PARAMETER_SEPARATOR ) + name + EQUALS_OPERATOR + paramValue; 
				isFirst = false;
			}
		}
		return queryString;
	}
	/**
	 * Gets the query parameter string with the give name and value.
	 * 
	 * @param paramName
	 * @param value
	 * @return
	 */
	public static String getQueryParameterString( String paramName, String value )
	{
		StringBuffer b = new StringBuffer( );
		b.append( PARAMETER_SEPARATOR );
		b.append( paramName );
		b.append( EQUALS_OPERATOR );
		b.append( value );
		return b.toString( );