Currently if a timeseries called MARKET_VALUE (MarketDataRequirementNames.MARKET_VALUE) does not exist , then security or portfolio is not linked to the timeseries. I feel checking for existence of any timeseries related to the security and then displaying it , would be the best. Or at-least a configuration variable to decide which timeseries should be linked will also be good enough.
That issue is now resolved in the develop branch, it should show all time series associated with a given security now, not just MARKET_VALUE.