babel_extract doesn't work unless messages.pot already exists

[eyal0]

I found this line confusing:

https://github.com/foosel/OctoPrint/blob/e5eb72cbfbe90747425dcdb746f2910f84385c4b/src/octoprint_setuptools/__init__.py#L527

I see no need for it. Might as well allow babel_extract to work whether or not messages.pot already exists.

One workaround that works for me is to create an empty messages.pot file first. Then babel_extract will work

[GitIssueBot]

Hi @eyal0,

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[eyal0]

Refiled as #2846