Two small remarks:

a) Could you make the lines shorter?
b) Since you are within () there is no need for the \. You can simply do:

flask.abort(404, 'No content found in the repository, '
                  'to know more about the documentation please visit '
                  '<a href="....">....</a>'
)

Or something like this :)

Another thing we could do is adding a small test for this feature, maybe something like:

diff --git a/ tests/test_pagure_flask_docs.py b/ tests/test_pagure_flask_docs.py
index a954aec..a6a2a42 100644
--- a/tests/test_pagure_flask_docs.py  
+++ b/tests/test_pagure_flask_docs.py  
@@ -163,6 +163,12 @@ class PagureFlaskDocstests(tests.Modeltests):
         output = self.app.get('/test/docs')
         self.assertEqual(output.status_code, 404)
+        self.assertIn(
+            '<p>No content found in the repository, to know more about the '
+            'documentation please visit '
+            'https://docs.pagure.org/pagure/usage/using_doc.html</p>',
+            output.data
+        )
         output = self.app.get('/test/sources')
         self.assertEqual(output.status_code, 200)

To adjust based on the change you make :)

@pingou, looking good ?

Yup, feel free to rebase while I test it locally :)

Did you test it, yourself?

Did you test it, yourself?

Not actually. When i had 'git grep "No content found in the repository" ' , i just found the string and thought of replacing it with a better one.

Then I would encourage you to test your change and see how it looks :)

Any progress on this one?

@pingou previously I was having a little issue reproducing the bug but now I am able to.

Figuring out a way to add a link in the flask.abort() !

Any news on this? Need some help?

We were looking on how to do this and @charcol just gave us a great example in https://pagure.io/pagure/pull-request/1998 :)

Ah! thats awesome ! Let me try it :)

Did it work?

ping?

@rahulbajaj there has not been any updates from you on this PR since March 3rd, so I will close it and will open one addressing this ticket.

Thanks for starting the work on this!