When route is registered with empty path it is normalized to /.

[aldas]

When route is registered with empty path it is normalized to /. Make sure that returned echo.Route structs reflect that behavior. Internally router has changed `` (empty path) to / for a long time but Route that is returned did not reflect that. Is is problematic with `Reverse` function that uses empty string as "not found"

Related to #2615

Previous behavior can be seen with this test:

func TestTest(t *testing.T) {
	e := echo.New()

	handler := func(c echo.Context) error {
		return c.String(http.StatusNotImplemented, "Nope")
	}
	r := e.GET("", handler) // path is registered as "" previously. After change `/` is registered
	r.Name = "test"

	existingEmpty := e.Reverse("test")
	assert.Equal(t, "", existingEmpty)

	notExistingEmpty := e.Reverse("not-existing")
	assert.Equal(t, "", notExistingEmpty)
}

whis this change assert.Equal(t, "", existingEmpty) shoulb be change to assert.Equal(t, "/", existingEmpty)to pass the test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.03%. Comparing base (d549290) to head (65d0914).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2616   +/-   ##
=======================================
  Coverage   93.02%   93.03%           
=======================================
  Files          41       41           
  Lines        4703     4707    +4     
=======================================
+ Hits         4375     4379    +4     
  Misses        236      236           
  Partials       92       92           

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