add warning

gufe/components/smallmoleculecomponent.py

@@ -2,6 +2,7 @@
 # For details, see https://github.com/OpenFreeEnergy/gufe
 
 import logging
+import warnings
 
 # openff complains about oechem being missing, shhh
 logger = logging.getLogger("openff.toolkit")
@@ -282,6 +283,9 @@ def _from_dict(cls, d: dict):
             try:
                 a.SetHybridization(_INT_TO_HYBRIDIZATION[atom[7]])
             except IndexError:
+                warnings.warn("The atom hybridization data was not found and has been set to unspecified. This can be"
+                              " fixed by recreating the SmallMoleculeComponent from the rdkit molecule after running "
+                              "sanitization.")
                 pass
 
             em.AddAtom(a)

gufe/tests/test_smallmoleculecomponent.py

@@ -361,7 +361,8 @@ def test_from_dict_missing_hybridization(self, phenol):
             # remove the hybridization atomic info which should be at index 7
             new_atoms.append(tuple([atom_info for i, atom_info in enumerate(atom) if i != 7]))
         phenol_dict["atoms"] = new_atoms
-        new_phenol = SmallMoleculeComponent.from_dict(phenol_dict)
+        with pytest.warns(match="The atom hybridization data was not found and has been set to unspecified."):
+            new_phenol = SmallMoleculeComponent.from_dict(phenol_dict)
         # they should be different objects due to the missing hybridization info
         assert new_phenol != phenol
         # make sure the rdkit objects are different