two small fixes: bugfix with older python and error ran into with a user program

app_skellington/cli.py

@@ -80,11 +80,25 @@ class CommandTree:
         Creates a root-level submenu with no entries. SubMenu node is
         returned which can have submenus and commands attached to it.
         """
+        # NOTE(MG) Fix below strategizes whether to pass in 'required'
+        # paremter to ArgumentParser.add_subparsers()
+        # which was added in in Python3.7.
+        func_args = {
+            'dest': param_name,
+            'metavar': param_name,
+            'required': is_required
+        }
+        if (
+            sys.version_info.major == 3
+            and sys.version_info.minor <= 6
+        ):
+            if is_required:
+                _bootstrap_logger.warn('Unable to enforce required submenu: Requires >= Python 3.7')
+            del func_args[required]
+
         # Creates an argument as a slot in the underlying argparse.
         subparsers = self.root_parser.add_subparsers(
-            dest = param_name,
-            metavar = param_name,
-            required = is_required
+            **func_args
         )
 
         submenu = SubMenu(self, subparsers, param_name)

app_skellington/log.py

@@ -108,8 +108,11 @@ class LoggingLayer:
 
         # Replace 'root' logger with '', logging module convention for root handler
         # Note: '' is disallowed in ConfigObj (hence the reason for this replacement)
-        config_dict['loggers'][''] = config_dict['loggers']['root']
-        del config_dict['loggers']['root']
+        try:
+            config_dict['loggers'][''] = config_dict['loggers']['root']
+            del config_dict['loggers']['root']
+        except Exception as ex:
+            _bootstrap.logger.warn('internal failure patching root logger')
 
 
         # Evaluate the full filepath of the file handler