panic: runtime error: integer divide by zero

[na--]

Created because of https://community.k6.io/t/warn-0000-error-getting-terminal-size/767

Environment

• k6 version: v0.27.0
• OS and version: Windows

Expected Behavior

Running a script with k6 shouldn't panic, ever.

Actual Behavior

For some terminals, k6 isn't able to get the current terminal width (needed for the new responsive progressbars) for some unknown reason, so it emits this warning:

 WARN[0000] error getting terminal size error=“The handle is invalid.”

then it panics with panic: runtime error: integer divide by zero 😞

my theory is that this code works as intended and falls back to width of 80: https://github.com/loadimpact/k6/blob/62e1b53391c2b2a8cd9e7af1d6a0cd70bd6227db/cmd/ui.go#L255-L258

but then we zero it out when we suppress the error here: https://github.com/loadimpact/k6/blob/62e1b53391c2b2a8cd9e7af1d6a0cd70bd6227db/cmd/ui.go#L334-L338