[bugfix] Fix KeyError in api.update_page for coordinates

Bug: T189398
Change-Id: I650d1cbb5e01ad2db5afa220a576c394d6dd5aa9
---
M pywikibot/data/api.py
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pywikibot/data/api.py b/pywikibot/data/api.py
index 1fed1f9..8a64bcc 100644
--- a/pywikibot/data/api.py
+++ b/pywikibot/data/api.py
@@ -3264,7 +3264,7 @@
                                          lon=co['lon'],
                                          typ=co.get('type', ''),
                                          name=co.get('name', ''),
-                                         dim=int(co['dim']),
+                                         dim=int(co.get('dim', 0)) or None,
                                          globe=co['globe'],  # See [[gerrit:67886]]
                                          )
             coords.append(coord)
