[12.x] Update Route::middleware to accept null #57436
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avosalmon changed the title Route::middleware to accept null avosalmon force-pushed the null-middleware branch 3 times, most recently from f5551bc to 9362c02 Compare 
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Route::middlewaremethod's PHPDoc says it accepts null. However, it throws the following exception when null is passed as middleware.Because of this, when we conditionally apply a middleware, we need to fallback to an empty array.
This PR fixes the issue by filtering out falsy values before registering middlewares.