hgview #89337 raise the right exception if ``--traceback`` [validation pending]

The right exception is expected to be raised while using the --traceback option.

Instead, a message like interface not available is displayed.

priorityimportant
typebug
done in1.6.0
load0.100
load left0.000
closed by#c27a1eb98cab [lib] do not swallow exception with ``--traceback`` (closes #89337)