wiki: Correct a failure when editing a page.

Occurs when the previous revision is hidden.

r2/r2/controllers/validator/wiki.py

@@ -208,9 +208,11 @@ def run(self, page):
         return (page, page != original_page)
 
 class VWikiPage(VWikiPageName):
-    def __init__(self, param, required=True, restricted=True, modonly=False, **kw):
+    def __init__(self, param, required=True, restricted=True, modonly=False,
+                 allow_hidden_revision=True, **kw):
         self.restricted = restricted
         self.modonly = modonly
+        self.allow_hidden_revision = allow_hidden_revision
         self.required = required
         Validator.__init__(self, param, **kw)
 
@@ -254,7 +256,7 @@ def validversion(self, version, pageid=None):
             return
         try:
             r = WikiRevision.get(version, pageid)
-            if r.is_hidden and not c.is_wiki_mod:
+            if not self.allow_hidden_revision and (r.is_hidden and not c.is_wiki_mod):
                 self.set_error('HIDDEN_REVISION', code=403)
                 raise AbortWikiError
             return r

r2/r2/controllers/wiki.py

@@ -76,7 +76,7 @@ class WikiController(RedditController):
     allow_stylesheets = True
 
     @wiki_validate(pv=VWikiPageAndVersion(('page', 'v', 'v2'), required=False, 
-                                          restricted=False),
+                                          restricted=False, allow_hidden_revision=False),
                    page_name=VWikiPageName('page'))
     def GET_wiki_page(self, pv, page_name):
         page, version, version2 = pv