StackExchange/StackExchange.DataExplorer — pull request #35 by tms (2014-02-01 23:16:38+00:00)
Title: Minor text-only results fixes

Per [this Meta report](http://meta.stackoverflow.com/questions/218363/data-explorer-always-says-0-rows-returned-when-text-only-results-is-checked), fix up the message when the results are text-only. Also avoid a possible invalid cast due to `DBNull` when converting results to text.