Merge pull request #111 from mrvisscher/missing_hasattr

Fix missing `hasattr` in `lca_base`

bw2calc/lca_base.py

@@ -198,7 +198,7 @@ def lcia(self, demand: Optional[dict] = None) -> None:
         Doesn't return anything, but creates ``self.characterized_inventory``.
 
         """
-        assert hasattr(self, "inventory") or (self, "inventories"), "Must do lci first"
+        assert hasattr(self, "inventory") or hasattr(self, "inventories"), "Must do lci first"
         if not self.dicts.biosphere:
             raise EmptyBiosphere