Don't populate dataset search box with 'undefined'. Closes #826.
Don't populate dataset search box with 'undefined'. Closes #826.

PalmBeachPost/panda,pandaproject/panda,newsapps/panda,NUKnightLab/panda,newsapps/panda,datadesk/panda,ibrahimcesar/panda,pandaproject/panda,datadesk/panda,NUKnightLab/panda,PalmBeachPost/panda,NUKnightLab/panda,datadesk/panda,PalmBeachPost/panda,newsapps/panda,datadesk/panda,PalmBeachPost/panda,ibrahimcesar/panda,ibrahimcesar/panda,ibrahimcesar/panda,NUKnightLab/panda,pandaproject/panda,datadesk/panda,newsapps/panda,PalmBeachPost/panda,pandaproject/panda,ibrahimcesar/panda,pandaproject/panda