Prevent exceptions being masked by undefined method errors in ruby 2.4 #135
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@glejeune - This may be a ruby 2.4 idiosynracy, I didn't take the time to diagnose it further.
Essentially, sometimes the status returned from output_and_errors_from_command is nil, which does not respond to
zero?
; causing the actual commands errors to be masked.This patches that so the underlying graphviz usage errors can bubble up.
I believe this resolves both #133 and #125