KeyError in _diff_finder.py_

[dvvanessastoiber]

• Release number or git hash: 23b72f6
• Web browser version and OS: Chrome 78
• Environment (local or deployed): local and deployed

Steps to reproduce

1. Open https://taco.caleydoapp.org/api/taco/compare/tacoServerLastFm2005-01/tcgaGbm20130923Microrna/60/60/structure,structure,content,nochange/histogram

Originally occured after these steps:

1. Open taco.caleydoapp.org
2. Choose mRNA-seq as Dataset
3. Select the first two Datasets and click Load Detail View

Observed behavior

• Internal Server Error that is triggered by a KeyError in diff_finder.py

Expected behavior

• Json with keys rows and cols and in this case empty values should be returned:

{
"rows": [],
"cols": []
}