`fractal version` does not fail with server down

Coverage report

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File	Statements	Missing	Coverage	Coverage (new stmts)
fractal_client/cmd
__init__.py	$This PR adds 5 to the number of statements in fractal_client/cmd/__init__.py, taking it from 223 to 228.$	$This PR doesn't change the number of statements missing coverage in fractal_client/cmd/__init__.py, which is 3.$	$This PR adds 0.02 percentage points to the coverage rate in fractal_client/cmd/__init__.py, taking it from 98.67% (220/223) to 98.69% (225/228).$	$In this PR, 7 new statements are added to fractal_client/cmd/__init__.py, 7 of which are covered (100%).$
Project Total