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Exception: Data must be 1-dimensional from sc.pl.rank_genes_groups_violin

See original GitHub issue

I was using the sc.pl.rank_genes_groups_violinfunction and got the error:

Exception                                 Traceback (most recent call last)
<ipython-input-195-8f87448845a3> in <module>
      1 sc.tl.rank_genes_groups(adata, 'leiden', groups=['0'], reference='1', method='wilcoxon')
----> 2 sc.pl.rank_genes_groups_violin(adata, groups='0', n_genes=1)

~/miniconda3/envs/scrna/lib/python3.7/site-packages/scanpy/plotting/_tools/__init__.py in rank_genes_groups_violin(adata, groups, n_genes, gene_names, gene_symbols, use_raw, key, split, scale, strip, jitter, size, ax, show, save)
    727             if issparse(X_col): X_col = X_col.toarray().flatten()
    728             new_gene_names.append(g)
--> 729             df[g] = X_col
    730         df['hue'] = adata.obs[groups_key].astype(str).values
    731         if reference == 'rest':

~/miniconda3/envs/scrna/lib/python3.7/site-packages/pandas/core/frame.py in __setitem__(self, key, value)
   2936         else:
   2937             # set column
-> 2938             self._set_item(key, value)
   2939 
   2940     def _setitem_slice(self, key, value):

~/miniconda3/envs/scrna/lib/python3.7/site-packages/pandas/core/frame.py in _set_item(self, key, value)
   2997         """
   2998 
-> 2999         self._ensure_valid_index(value)
   3000         value = self._sanitize_column(key, value)
   3001         NDFrame._set_item(self, key, value)

~/miniconda3/envs/scrna/lib/python3.7/site-packages/pandas/core/frame.py in _ensure_valid_index(self, value)
   3052         if not len(self.index) and is_list_like(value) and len(value):
   3053             try:
-> 3054                 value = Series(value)
   3055             except (ValueError, NotImplementedError, TypeError):
   3056                 raise ValueError(

~/miniconda3/envs/scrna/lib/python3.7/site-packages/pandas/core/series.py in __init__(self, data, index, dtype, name, copy, fastpath)
    303                     data = data.copy()
    304             else:
--> 305                 data = sanitize_array(data, index, dtype, copy, raise_cast_failure=True)
    306 
    307                 data = SingleBlockManager(data, index, fastpath=True)

~/miniconda3/envs/scrna/lib/python3.7/site-packages/pandas/core/construction.py in sanitize_array(data, index, dtype, copy, raise_cast_failure)
    480     elif subarr.ndim > 1:
    481         if isinstance(data, np.ndarray):
--> 482             raise Exception("Data must be 1-dimensional")
    483         else:
    484             subarr = com.asarray_tuplesafe(data, dtype=dtype)

Exception: Data must be 1-dimensional

...

...

Versions:

scanpy==1.4.6 anndata==0.7.1 umap==0.4.2 numpy==1.18.3 scipy==1.4.1 pandas==1.0.3 scikit-learn==0.22.2.post1 statsmodels==0.11.1 python-igraph==0.8.2 louvain==0.6.2