Bug 140974 bad assert in ScalarParameterFragment
The following assert appears around line 98 in org.eclipse.birt.report.viewer.aggregation.parameter.ScalarParameterFragment assert paramDefaultValueObj instanceof String; If the report does not have a default value for the parameter in the report, then this assert fails even though the code that follows it explicitly handles a null value. Since null is a valid value, the assert should be assert (paramDefaultValueObj == null) || (paramDefaultValueObj instanceof String);
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
isFirst = false;
			}
		}
		if ( nullParams != null && nullParams.size( ) > 0 )
		{
			Iterator i = nullParams.iterator( );
			while ( i.hasNext( ) )
			{
				String paramName = (String) i.next( );
				if ( paramName != null && !paramName.equalsIgnoreCase( name ) )
				{
					paramName = urlEncode( paramName, UTF_8_ENCODE );
					queryString += ( isFirst ? "" : PARAMETER_SEPARATOR ) + PARAM_ISNULL + EQUALS_OPERATOR + paramName;  
					isFirst = false;
				}
			}
		}
		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;
	}
	/**