handle handsontable values if empty

src/jflow/workflow.py

@@ -349,15 +349,16 @@ class Workflow(threading.Thread):
             elif param.__class__ == MultiParameterList:
                 new_param = MultiParameterList(param.name, param.help, required=param.required, flag=param.flag, group=param.group, display_name=param.display_name)
                 new_param.sub_parameters = param.sub_parameters
-                for idx, sargs in enumerate(args[param.name]):
-                    new_multi_param = MultiParameter(param.name + '_' + str(idx), '', required=False, flag=None, group="default", display_name=None)
-                    sub_args = {}
-                    for sarg in sargs:
-                        sub_args[sarg[0]] = sarg[1]
-                    for sub_param in param.sub_parameters:
-                        new_sub_param = self._prepare_parameter(sub_args, sub_param, "flag")
-                        new_multi_param[new_sub_param.name] = new_sub_param
-                    new_param.append(new_multi_param)
+                if args.has_key(param.name):
+                    for idx, sargs in enumerate(args[param.name]):
+                        new_multi_param = MultiParameter(param.name + '_' + str(idx), '', required=False, flag=None, group="default", display_name=None)
+                        sub_args = {}
+                        for sarg in sargs:
+                            sub_args[sarg[0]] = sarg[1]
+                        for sub_param in param.sub_parameters:
+                            new_sub_param = self._prepare_parameter(sub_args, sub_param, "flag")
+                            new_multi_param[new_sub_param.name] = new_sub_param
+                        new_param.append(new_multi_param)
             else:
                 new_param = self._prepare_parameter(args, param)
             self.__setattr__(param.name, new_param)