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Raise appropriate exception if ldda not found
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 ```