[bugfix] use get to get an empty dict if plot params don't have data …

…key.

autopilot/core/plots.py

@@ -365,7 +365,7 @@ def l_start(self, value):
             pass
 
         # Make plot items for each data type
-        for data, plot in self.plot_params['data'].items():
+        for data, plot in self.plot_params.get('data', {}).items():
             # TODO: Better way of doing params for plots, redo when params are refactored
             if plot == 'rollmean' and 'roll_window' in self.plot_params.keys():
                 self.plots[data] = Roll_Mean(winsize=self.plot_params['roll_window'])