Redcap parser fails for files with descriptive fields and no label text

Noticed when parsing  PastHeartRelatedProcedures_DataDictionary_2014-02-21_2.csv.
There were records  with field type = descriptive that contained no "Field label" text, but are where the images are supposed to go. This caused the error because the Question model validates for the presence of text.
Solved this by adding some dummy placeholder text for these situations.