sdbus++: fix NamedElement exception handling
sdbus++: fix NamedElement exception handling

The exception handling in NamedElement.__getattribute__ changed
behavior in an attempt to resolve issues reported by pycodestyle.

The original code had a generic 'except:' which was warned by
pycodestyle and then was changed to 'except e:'.  This syntax
means it only handles an exception of type 'e' (this was intended
to be something like 'except Exception as e:').  Fix by replacing
'e' with the generic exception type 'Exception'.

Fixes 9f77a47af1585a17c0c4e93afe1f935eb78e827e.

Signed-off-by: Patrick Williams <cbb7353e6d953ef360baf960c122346276c6e320@stwcx.xyz>
Change-Id: I767a41a0dc619c110ff40a2bf17739c59ee7864c

openbmc/sdbusplus,openbmc/sdbusplus,openbmc/sdbusplus,openbmc/sdbusplus