Bug 201030 NPE throws out when preview the attached report design
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/script/ScriptEvalUtil.java
{
			resultOp[i] = opTextAndValue[i].value;
		}
		Object[] obArray = MiscUtil.isComparable( obj, operator, opTextAndValue );
		if ( obArray != null )
		{
			resultObject = obArray[0];
			for ( int i = 1; i < obArray.length; i++ )
			{
				resultOp[i - 1] = obArray[i];
			}
		}
		
		if ( logger.isLoggable( Level.FINER ) )
		{
			String logStr ="";
			for ( int i = 0; i < ops.length; i++ )
			{
				logStr += resultOp[i] == null
						? null
						: ( ", resultOp" + i + "=" + LogUtil.toString( resultOp[i] ) );
			}
			logger.entering( ScriptEvalUtil.class.getName( ),
					"evalConditionalExpr",
					"evalConditionalExpr() resultObject=" +
							LogUtil.toString( resultObject ) + ", operator=" +
							operator + logStr );
		}
		boolean result = false;
		switch ( operator )