Merge pull request #1292 from discort/feature_1291

fixed peewee in list filters bug using postgres

flask_admin/contrib/peewee/filters.py

@@ -99,7 +99,7 @@ class FilterInList(BasePeeweeFilter):
         return [v.strip() for v in value.split(',') if v.strip()]
 
     def apply(self, query, value):
-        return query.filter(self.column << value)
+        return query.filter(self.column << (value or [None]))
 
     def operation(self):
         return lazy_gettext('in list')
@@ -108,7 +108,7 @@ class FilterInList(BasePeeweeFilter):
 class FilterNotInList(FilterInList):
     def apply(self, query, value):
         # NOT IN can exclude NULL values, so "or_ == None" needed to be added
-        return query.filter(~(self.column << value) | (self.column >> None))
+        return query.filter(~(self.column << (value or [None])) | (self.column >> None))
 
     def operation(self):
         return lazy_gettext('not in list')