morpho fails to delete package
Using version 1.1.0, I tried to "Delete Metacat Copy" on a package that only
existed on metacat. The operation generated the error: "Error in
DataPackage.DataPackage: String index out of range: -1". Obviously, it didn't work.
As a side effect, when I cleared the error dialog, the morpho bitterfly in the
result pane was still flapping away, even though I got the impression that the
attempted delete operation was all done. So, we need to check that the
butterfly stops flapping in all cases, including when errors are generated.