[BugFix] Fix Empty Build Fail

[deeleeramone]

1. Why?:

   • When no core router or provider components are installed, the app fails to build.

    "paths": ReferenceGenerator.get_paths(self.route_map),
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/danglewood/miniconda3/miniconda3/envs/empty/lib/python3.11/site-packages/openbb_core/app/static/package_builder.py", line 1731, in get_paths
    providers = provider_parameter_fields["type"]
                ^^^^^^^^^^^^^^^^^^^^^^^^^
UnboundLocalError: cannot access local variable 'provider_parameter_fields' where it is not associated with a value

2. What?:

   • Initializing provider_parameter_fields in the lines above resolves the issue and an app with no router or provider extensions can be successfully built and initialized.

3. Impact:

   • Easier to build minimal and custom configurations.

4. Testing Done:

   • Create a router extension with openbb-core as the dependency.
   • New environment with no other components.

After:

[deeleeramone]

#6458 ? Codespell is tripping out in unrelated files.