return right away if irods_sesh is None

pymods/irods_utils/irods_utils.py

@@ -243,6 +243,10 @@ def confirmed_put( irods_sesh, file, new_obj_ipath, metadata_dict=None, datatype
                  + " datatype: " + datatype
                  + " block_size: " + str( block_size ) )
 
+    if irods_sesh == None:
+        logging.error( "irods_sesh == None" )
+        return None
+
     # We want a hash of our file. Should put this off in a separate thread?
     try:
         sha = hashlib.sha512()