[24.1] Raise appropriate exception if ldda not found

[mvdbeek]

Fixes
https://sentry.galaxyproject.org/share/issue/db137d5e4eae40eea9b0fe85ffac4b19/:

AssertionError: null
  File "galaxy/web/framework/decorators.py", line 346, in decorator
    rval = func(self, trans, *args, **kwargs)
  File "galaxy/webapps/galaxy/api/tools.py", line 593, in create
    return self.service._create(trans, payload, **kwd)
  File "galaxy/webapps/galaxy/services/tools.py", line 155, in _create
    self._patch_library_inputs(trans, inputs, target_history)
  File "galaxy/webapps/galaxy/services/tools.py", line 276, in _patch_library_inputs
    patched = self._patch_library_dataset(trans, value, target_history)
  File "galaxy/webapps/galaxy/services/tools.py", line 284, in _patch_library_dataset
    assert ldda

How to test the changes?

(Select all options that apply)

• I've included appropriate automated tests.
• This is a refactoring of components with existing test coverage.
• Instructions for manual testing are as follows:
  1. [add testing steps and prerequisites here if you didn't write automated tests covering all your changes]

License

• I agree to license these and all my past contributions to the core galaxy codebase under the MIT license.