jp (blog/edit): --no-publish is a boolean option

sat_frontends/jp/cmd_blog.py

@@ -468,6 +468,7 @@ class Edit(base.CommandBase, BlogPublishCommon, common.BaseEdit):
         )
         self.parser.add_argument(
             "--no-publish",
+            action="store_true",
             help=_('add "publish: False" to metadata'),
         )
 
@@ -510,7 +511,7 @@ class Edit(base.CommandBase, BlogPublishCommon, common.BaseEdit):
         # and override metadata with command-line arguments
         self.setMbDataFromArgs(mb_data)
 
-        if self.args.no_publish is not None:
+        if self.args.no_publish:
             mb_data["publish"] = False
 
         # then we create the file and write metadata there, as JSON dict