Variable referenced before assignment in _get_rep

[WeilerP]

Description

In scvelo/preprocessing/neighbors.py::_get_rep, the variable rep is referenced before assigned when not entering the if-else clause.

import scvelo as scv
from scvelo.preprocessing.neighbors import _get_rep

adata = scv.datasets.pancreas()
use_rep = _get_rep(adata, use_rep="random", n_pcs=None)

Error output

---------------------------------------------------------------------------
UnboundLocalError                         Traceback (most recent call last)
<ipython-input-4-eae99bea90f1> in <module>
      1 adata = scv.datasets.pancreas()
----> 2 use_rep = _get_rep(adata, use_rep="random", n_pcs=None)

~/code/scvelo/scvelo/preprocessing/neighbors.py in _get_rep(adata, use_rep, n_pcs)
     77         )
     78 
---> 79     return rep
     80 
     81 

UnboundLocalError: local variable 'rep' referenced before assignment

Versions

scvelo==0.2.5.dev56+g9ff8098.d20211206  scanpy==1.7.2  anndata==0.7.6  loompy==3.0.6  numpy==1.20.3  scipy==1.6.3  matplotlib==3.4.2  sklearn==0.24.2  pandas==1.2.4

[WeilerP]

Closed via #797.