Unable to create multipage apps

[FRYoussef]

There's a bug related to the dash component 'dcc.Location', which manages the browser URL.

The callback fired by the 'dcc.Location' component, which is used as entry point to each app, is fired more than once, so the layout is loaded (but not rendered) many times, this brakes the layout callbacks.

This is not a fatal error for now, 'cause we just have one app, however, in the future, it'll can be a big thing.

[FRYoussef]

Fixed updating dash to 1.16.2