[FIX] OWAlignDatasts: Show error when only one data source

biolab / orange3-single-cell

🍊🔬 Orange add-on for gene expression of single cell data

https://singlecell.biolab.si/

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Closed PrimozGodec closed 5 years ago

PrimozGodec commented 5 years ago

Widget chrashes when receives data with only one data source

Now it shows an error when it happens.