Hebrew: error when adding an unvocalized adposition if the vocalized version was added and deleted beforehand

[dotdv]

I created a page for the vocalized adposition 'בְּמֶשֶׁךְ', deleted it and then tried to create a new page for the same adposition, just unvocalized: 'במשך'.
I got an error:

Request Method:	POST
http://flat.nert.georgetown.edu/he/_plugin/metadata/createp/
1.11.14
IntegrityError
UNIQUE constraint failed: wiki_urlpath.site_id, wiki_urlpath.parent_id, wiki_urlpath.slug
/home/ns1057/Xposition_env/lib/python3.6/site-packages/django/db/backends/sqlite3/base.py in execute, line 328
/usr/bin/python3
3.6.0
['/home/ns1057/Xposition_env/Xposition/testproject', '/home/ns1057/Xposition_env/lib/python36.zip', '/home/ns1057/Xposition_env/lib/python3.6', '/home/ns1057/Xposition_env/lib/python3.6/lib-dynload', '/opt/anaconda3/lib/python3.6', '/home/ns1057/Xposition_env/lib/python3.6/site-packages', '/home/ns1057/Xposition_env/Xposition/testproject/testproject', '/home/ns1057/Xposition_env/Xposition/testproject', '/home/ns1057/Xposition_env/lib/python3.6/site-packages/odf', '/home/ns1057/Xposition_env/lib/python3.6/site-packages/odf', '/home/ns1057/Xposition_env/lib/python3.6/site-packages/odf', '/home/ns1057/Xposition_env/lib/python3.6/site-packages/odf', '/home/ns1057/Xposition_env/lib/python3.6/site-packages/odf', '/home/ns1057/Xposition_env/lib/python3.6/site-packages/odf', '/home/ns1057/Xposition_env/lib/python3.6/site-packages/odf']
Thu, 6 Sep 2018 09:24:25 -0400

[ablodge]

Alright, what's happening is (1) the deleted article still exists, but is marked "deleted", (2) when creating a new article the url gets its vowels stripped converting '/he/בְּמֶשֶׁךְ' to '/he/במשך' which is already taken, (3) Django panics and sends us an error.

We need to add a validator to the create article form that checks if the url already exists (even if the article doesn't) and give a useful error message.