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
scope,
							source,
							lineNo );
					Object Op2 = evalExpr( MiscUtil.constructValidScriptExpression( (IScriptExpression) conditionalExpr.getOperand2( ) ),
							cx,
							scope,
							source,
							lineNo );
					result = evalConditionalExpr( expression,
							conditionalExpr.getOperator( ),
							new Object[]{
									Op1, Op2
							} );
				}
			}
		}
		else
		{
			IScriptExpression jsExpr = (IScriptExpression) expr;
			if ( jsExpr.getText( ) != null && jsExpr.getHandle( ) != null )
			{
				result = ((CompiledExpression) jsExpr.getHandle( ) ).evaluate( cx, scope );
			}
			else
			{
				result = evaluateJSAsExpr( cx,
						scope,
						jsExpr.getText( ),
						source,
						lineNo );