Can't run .load_query_data() multiple times in a row

[alitinet]

Cat cov shape mismatch if running .load_query_data() several times in a row without changing the ref model/ref adata.

[HelloWorldLTY]

Hi, I meet this error when loading the query data, and it is caused by the mismatched covariates between the training and testing data (like different diseases). I find a solution for it by modifying the codes in .load_query_data(). If you are interested in it, I can start a pull request.