Fix the following error in unit tests:
```
AttributeError: 'TestToolShedConfig' object has no attribute 'hgweb_repo_prefix'
```
caused by merging commit b00beec3d2
forward.
Fixes https://sentry.galaxyproject.org/share/issue/026b0ea1f8aa478daea1cdb0b18df78a/:
```
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x8b in position 1: invalid start byte
File "starlette/applications.py", line 123, in __call__
await self.middleware_stack(scope, receive, send)
File "starlette/middleware/errors.py", line 186, in __call__
raise exc
File "starlette/middleware/errors.py", line 164, in __call__
await self.app(scope, receive, _send)
File "starlette_context/middleware/raw_middleware.py", line 92, in __call__
await self.app(scope, receive, send_wrapper)
File "starlette/middleware/base.py", line 189, in __call__
with collapse_excgroups():
File "contextlib.py", line 155, in __exit__
self.gen.throw(typ, value, traceback)
File "starlette/_utils.py", line 93, in collapse_excgroups
raise exc
File "starlette/middleware/base.py", line 191, in __call__
response = await self.dispatch_func(request, call_next)
File "galaxy/webapps/galaxy/fast_app.py", line 109, in add_x_frame_options
response = await call_next(request)
File "starlette/middleware/base.py", line 165, in call_next
raise app_exc
File "starlette/middleware/base.py", line 151, in coro
await self.app(scope, receive_or_disconnect, send_no_error)
File "starlette/middleware/exceptions.py", line 62, in __call__
await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
File "starlette/_exception_handler.py", line 64, in wrapped_app
raise exc
File "starlette/_exception_handler.py", line 53, in wrapped_app
await app(scope, receive, sender)
File "starlette/routing.py", line 758, in __call__
await self.middleware_stack(scope, receive, send)
File "starlette/routing.py", line 778, in app
await route.handle(scope, receive, send)
File "starlette/routing.py", line 299, in handle
await self.app(scope, receive, send)
File "starlette/routing.py", line 79, in app
await wrap_app_handling_exceptions(app, request)(scope, receive, send)
File "starlette/_exception_handler.py", line 64, in wrapped_app
raise exc
File "starlette/_exception_handler.py", line 53, in wrapped_app
await app(scope, receive, sender)
File "starlette/routing.py", line 74, in app
response = await func(request)
File "fastapi/routing.py", line 278, in app
raw_response = await run_endpoint_function(
File "fastapi/routing.py", line 193, in run_endpoint_function
return await run_in_threadpool(dependant.call, **values)
File "starlette/concurrency.py", line 42, in run_in_threadpool
return await anyio.to_thread.run_sync(func, *args)
File "anyio/to_thread.py", line 56, in run_sync
return await get_async_backend().run_sync_in_worker_thread(
File "anyio/_backends/_asyncio.py", line 2144, in run_sync_in_worker_thread
return await future
File "anyio/_backends/_asyncio.py", line 851, in run
result = context.run(func, *args)
File "galaxy/webapps/galaxy/api/datasets.py", line 446, in show
return self.service.show(trans, dataset_id, hda_ldda, serialization_params, data_type, **extra_params)
File "galaxy/webapps/galaxy/services/datasets.py", line 395, in show
rval = self._raw_data(trans, dataset, **extra_params)
File "galaxy/webapps/galaxy/services/datasets.py", line 1009, in _raw_data
return DataResult(data=list(dataset.datatype.dataprovider(dataset, provider, **kwargs)))
File "galaxy/datatypes/dataproviders/base.py", line 262, in __iter__
for datum in parent_gen:
File "galaxy/datatypes/dataproviders/base.py", line 199, in __iter__
for datum in parent_gen:
File "galaxy/datatypes/dataproviders/base.py", line 137, in __iter__
yield from self.source
File "galaxy/datatypes/dataproviders/base.py", line 137, in __iter__
yield from self.source
File "<frozen codecs>", line 322, in decode
```