Avoid NRE in install-from-ckan (fixes #2171) #2205
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Fixes #2171; see that issue for details. To sum up, loading a .ckan file can raise exceptions, and currently they're not handled well. In Cmdline they are caught by the uncaught exception handler, and in GUI the exception handler itself causes a null reference exception.
Now in both cases we properly print out the error using an IUser reference.