do not abort on meetings on unknown commissions (#5543)

tabellio/pcfdb/sync.py

@@ -238,7 +238,10 @@ class SyncFromPcfDbView(BrowserView):
         cat_id = self.plone_utils.normalizeString(category)
         folder = getattr(self.commissions_folder, cat_id)
         code_id = self.plone_utils.normalizeString(code)
-        obj = getattr(folder, code_id)
+        try:
+            obj = getattr(folder, code_id)
+        except AttributeError:
+            return None
         self._commissions[com_id] = obj
         return obj
 
@@ -1305,6 +1308,9 @@ class SyncFromPcfDbView(BrowserView):
             commission = None
             if comid:
                 commission = self.get_commission(comid)
+                if commission is None:
+                    log.warning('invalid commission for reunion, (comid: %s, reu_id: %s)', comid, reu_id)
+                    continue
 
             if datedeb:
                 if heuredeb: