Dataset add overrides existing files in a dataset

[jsam]

Let's say we have a following use case:

renku dataset create ds1
renku dataset add ds1 ../data1/datafile
renku dataset add ds1 ../data2/datafile

In this scenario, as a user I would expect that now I have 2 files in a dataset since (beside the name) data files are different. Current behavior is that renku add overrides the previous record silently.

As a user I would expect that second add fails with a error or that we succeed with an add operation.

[mohammad-alisafaee]

I cannot reproduce this. When adding a file with the same name the following error is printed:

Error: File already exists in dataset. Use --force to add.

It seems to be fixed by #877