Fix bugs with parameters from GUI.

src/jflow/parameter.py

@@ -67,8 +67,6 @@ def urlfile(file):
         raise argparse.ArgumentTypeError("URL '" + file + "' does not contain any file name!")
 
 def inputfile(file):
-    if file == None:
-        return None
     # test the format
     uri_object = urlparse(file)
     # check the file

src/jflow/workflow.py

@@ -240,14 +240,17 @@ class Workflow(threading.Thread):
                                                   required=parameter.required, flag=parameter.flag, group=parameter.group, 
                                                   display_name=parameter.display_name )
         elif parameter.__class__ ==  ParameterList:
+            if value == "" : value = [] # from GUI
             new_param = ParameterList( parameter.name, parameter.help, default=value, type=parameter.type, choices=parameter.choices,
                                        required=parameter.required, flag=parameter.flag, sub_parameters=parameter.sub_parameters,
                                        group=parameter.group, display_name=parameter.display_name )
         elif parameter.__class__ == InputFileList:
+            if value == "" : value = [] # from GUI
             new_param = InputFileList( parameter.name, parameter.help, file_format=parameter.file_format, default=parameter.prepare_input_files(value),
                                        type=parameter.type, choices=parameter.choices, required=parameter.required, flag=parameter.flag,
                                        group=parameter.group, display_name=parameter.display_name, size_limit=parameter.size_limit )
         elif parameter.__class__ == InputFile:
+            if value == "" : value = None # from GUI
             new_param = InputFile( parameter.name, parameter.help, file_format=parameter.file_format, default=parameter.prepare_input_file(value), 
                                    type=parameter.type, choices=parameter.choices, required=parameter.required, flag=parameter.flag, 
                                    group=parameter.group, display_name=parameter.display_name )