a couple of gui bugs ...

Author: nickzoic

countess/core/parameters.py

@@ -491,6 +491,8 @@ def get_selected_type(self):
             return None
 
     def cast_value(self, value):
+        if self.value not in self.DATA_TYPES:
+            return None
         if value is not None:
             try:
                 return self.DATA_TYPES[self.value][0](value)

countess/gui/main.py

@@ -264,6 +264,7 @@ def choose_plugin(self, plugin_class):
         self.node.plugin = plugin_class()
         # self.node.prerun()
         self.node.is_dirty = True
+        self.node.run(self.ddbc, preview_row_limit)
         self.show_config_subframe()
         self.change_callback(self.node)