Fix bulkdata bug checking for paths ending in /

nilmdb/server/bulkdata.py

@@ -85,7 +85,7 @@ class BulkData(object):
         return path
 
     def _create_check_ospath(self, ospath):
-        if ospath[-1] == b'/':
+        if ospath[-1:] == b'/':
             raise ValueError("invalid path; should not end with a /")
         if Table.exists(ospath):
             raise ValueError("stream already exists at this path")