fix the bugs that were supposed to be already fixed

src/memberdb/actions.py

@@ -129,7 +129,7 @@ def refresh_dispense_payment(modeladmin, request, queryset):
     num_changed = 0
     membership_list = list(queryset)
     for ms in membership_list:
-        if ms.date_paid is not None or ms.username == '' or ms.username is None:
+        if ms.date_paid is not None:
             continue
         if try_update_from_dispense(ms):
             ms.save()

src/squarepay/cokelog.py

@@ -95,6 +95,10 @@ def try_update_from_dispense(membership):
     Note: this WILL overwrite any existing payment information
     """
 
+    if membership.member.username == '' or membership.member.username is None:
+        # can't do anything with empty usernames
+        return False
+
     # check if anything has happened since last time
     if member_cokelog.is_loaded():
         member_cokelog.reload()