add init-db call to flask tutorial
otherwise the user is confronted with an unpleasant error message when accessing the dev server the first time
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@ -49,12 +49,14 @@ Run
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export FLASK_APP=flaskr
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export FLASK_ENV=development
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flask init-db
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flask run
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Or on Windows cmd::
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set FLASK_APP=flaskr
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set FLASK_ENV=development
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flask init-db
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flask run
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Open http://127.0.0.1:5000 in a browser.
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