[instrumentation-django] - empty span name

[shaykeren]

Describe your environment
opentelemetry-instrumentation-django==0.30b1
django==4.0.4

Steps to reproduce
Having the following URL patterns:
`from django.urls import path
from . import views

urlpatterns = [
path('', views.index, name='index'),
path('list', views.list, name='list'),
]`
Please note that the path route has an empty value.

What is the expected behavior?
The expected behavior is not having an empty span name for this endpoint.
Also, consider returning http.route attribute with value '/'

What is the actual behavior?

• Got an empty span name
• No http.route attribute returned

[srikanthccv]

What do you expect the span name if not empty?

[shaykeren]

if an empty route has the same meaning of a route with a value of '/' then I would consider setting both the route and the name to '/'