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flask routes crashes if there is no route available #2751

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@timothyqiu

Description

@timothyqiu

Flask has a route for static files by default, and I disabled that by settingstatic_folder toNone.

fromflaskimportFlaskapp=Flask(__name__,static_folder=None)

Expected Behavior

With the code above, I expect the output offlask routes to be like this:

Endpoint  Methods  Rule--------  -------  -----------------------

or some message saying there is no route available.

Actual Behavior

But it crashed instead:

Traceback (most recent call last):  File"/Users/timothy/.virtualenvs/sample/bin/flask", line11, in<module>    sys.exit(main())  File"/Users/timothy/.virtualenvs/sample/lib/python3.6/site-packages/flask/cli.py", line890, inmain    cli.main(args=args,prog_name=name)  File"/Users/timothy/.virtualenvs/sample/lib/python3.6/site-packages/flask/cli.py", line557, inmainreturnsuper(FlaskGroup,self).main(*args,**kwargs)  File"/Users/timothy/.virtualenvs/sample/lib/python3.6/site-packages/click/core.py", line697, inmain    rv=self.invoke(ctx)  File"/Users/timothy/.virtualenvs/sample/lib/python3.6/site-packages/click/core.py", line1066, ininvokereturn _process_result(sub_ctx.command.invoke(sub_ctx))  File"/Users/timothy/.virtualenvs/sample/lib/python3.6/site-packages/click/core.py", line895, ininvokereturn ctx.invoke(self.callback,**ctx.params)  File"/Users/timothy/.virtualenvs/sample/lib/python3.6/site-packages/click/core.py", line535, ininvokereturn callback(*args,**kwargs)  File"/Users/timothy/.virtualenvs/sample/lib/python3.6/site-packages/click/decorators.py", line17, innew_funcreturn f(get_current_context(),*args,**kwargs)  File"/Users/timothy/.virtualenvs/sample/lib/python3.6/site-packages/flask/cli.py", line412, indecoratorreturn __ctx.invoke(f,*args,**kwargs)  File"/Users/timothy/.virtualenvs/sample/lib/python3.6/site-packages/click/core.py", line535, ininvokereturn callback(*args,**kwargs)  File"/Users/timothy/.virtualenvs/sample/lib/python3.6/site-packages/flask/cli.py", line841, inroutes_commandmax(len(rule.endpoint)for rulein rules),ValueError:max() arg is an empty sequence

Environment

  • Python version: 3.6.3
  • Flask version: 1.0.1
  • Werkzeug version: 0.14.1

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