When error is raised the response is badly formated

[vdias38]

If an error occured when service fetch stock quote, a cached response is returned. But on cached response there's an unexpected html warning preventing to use it.

"<br /> <b>Warning</b>: file_get_contents(https://query.yahooapis.com/v1/public/yql?q=select+%2A+from+yahoo.finance.quotes+where+symbol+in+%28%27CIEL3.SA%27%29&amp;format=json&amp;env=http%3A%2F%2Fdatatables.org%2Falltables.env): failed to open stream: HTTP request failed! HTTP/1.0 400 Bad Request
 in <b>/home/meumobi/PROJECTS/services.int-meumobilesite.com/releases/20140819/services/Service.php</b> on line <b>52</b><br /> {"query":{"count":1,"created":"2016-03-15T19:26:59Z","lang":"en-US","results":{"quote":{"symbol":"CIEL3.SA","Ask":"33.00","AverageDailyVolume":"5660500","Bid":"32.98","AskRealtime":null,"BidRealtime":null,"BookValue":"3.46","Change_PercentChange":"-0.27 - -0.81%","Change":"-0.27","Commission":null,"Currency":"BRL","ChangeRealtime":null,"AfterHoursChangeRealtime":null,"DividendShare":null,"LastTradeDate":"3/15/2016","TradeDate":null,"EarningsShare":"1.86","ErrorIndicationreturnedforsymbolchangedinvalid":null,"EPSEstimateCurrentYear":"1.97","EPSEstimateNextYear":null,"EPSEstimateNextQuarter":"0.00","DaysLow":"32.24","DaysHigh":"33.57","YearLow":"28.03","YearHigh":"49.06","HoldingsGainPercent":null,"AnnualizedGain":null,"HoldingsGain":null,"HoldingsGainPercentRealtime":null,"HoldingsGainRealtime":null,"MoreInfo":null,"OrderBookRealtime":null,"MarketCapitalization":"62.06B","MarketCapRealtime":null,"EBITDA":"5.20B","ChangeFromYearLow":"4.95","PercentChangeFromYearLow":"+17.66%","LastTradeRealtimeWithTime":null,"ChangePercentRealtime":null,"ChangeFromYearHigh":"-16.08","PercebtChangeFromYearHigh":"-32.78%","LastTradeWithTime":"12:34pm - <b>32.98</b>","LastTradePriceOnly":"32.98","HighLimit":null,"LowLimit":null,"DaysRange":"32.24 - 33.57","DaysRangeRealtime":null,"FiftydayMovingAverage":"32.11","TwoHundreddayMovingAverage":"35.30","ChangeFromTwoHundreddayMovingAverage":"-2.32","PercentChangeFromTwoHundreddayMovingAverage":"-6.58%","ChangeFromFiftydayMovingAverage":"0.87","PercentChangeFromFiftydayMovingAverage":"+2.72%","Name":"CIELO ON NM","Notes":null,"Open":"32.59","PreviousClose":"33.25","PricePaid":null,"ChangeinPercent":"-0.81%","PriceSales":"5.63","PriceBook":"9.60","ExDividendDate":"3/14/2016","PERatio":"17.71","DividendPayDate":null,"PERatioRealtime":null,"PEGRatio":"0.00","PriceEPSEstimateCurrentYear":null,"PriceEPSEstimateNextYear":null,"Symbol":"CIEL3.SA","SharesOwned":null,"ShortRatio":"0.00","LastTradeTime":"12:34pm","TickerTrend":null,"OneyrTargetPrice":null,"Volume":"1918600","HoldingsValue":null,"HoldingsValueRealtime":null,"YearRange":"28.03 - 49.06","DaysValueChange":null,"DaysValueChangeRealtime":null,"StockExchange":"SAO","DividendYield":null,"PercentChange":"-0.81%"}}}}"