`pyxroot.client.FileSystem.copy` crashes if the arguments are invalid with the error:
```
/cvmfs/lhcb.cern.ch/lib/lcg/releases/LCG_88/xrootd/4.5.0/x86_64-slc6-gcc49-opt/lib/python2.7/site-packages/XRootD/client/filesystem.py in copy(self, source, target, force)
65 object and None
66 """
---> 67 result = self.__fs.copy(source=source, target=target, force=force)[0]
68 return XRootDStatus(result), None
69
KeyError: 0
```
It happens as `FileSystem::Copy` returns `Status` instead of `tuple(Status, None)` if the the call to `FileSystem::Prepare` fails. See [PyXRootDFileSystem.cc#L59](https://github.com/xrootd/xrootd/blob/master/bindings/python/src/PyXRootDFileSystem.cc#L59) and [PyXRootDCopyProcess.cc#L122](https://github.com/xrootd/xrootd/blob/master/bindings/python/src/PyXRootDCopyProcess.cc#L122).
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