[bugfix] enable Namespace.content for mw < 1.16

Bug: T203491
Change-Id: I7bc12a28c82f59f8159976ce996f6671ba23927f
---
M pywikibot/site.py
1 file changed, 3 insertions(+), 0 deletions(-)

diff --git a/pywikibot/site.py b/pywikibot/site.py
index be63f15..4d22d01 100644
--- a/pywikibot/site.py
+++ b/pywikibot/site.py
@@ -2648,6 +2648,9 @@
                 if is_mw114:
                     canonical_name = nsdata.pop('canonical')
 
+            if 'content' not in nsdata:  # mw < 1.16
+                nsdata['content'] = ns == 0
+
             default_case = Namespace.default_case(ns)
             if 'case' not in nsdata:
                 nsdata['case'] = default_case or self.siteinfo['case']

