Update app.py

app.py

@@ -72,7 +72,8 @@ def predict(jobname, inputs, recycling_steps, sampling_steps, diffusion_samples)
             representations.append({"model":0, "chain":chain["chain"], "style":"cartoon"})
         if entity_type == "ligand":
             if "sdf" in chain.keys():
-                raise gr.Error("Sorry no SDF support yet")
+                if chain["sdf"]!="":
+                    raise gr.Error("Sorry no SDF support yet")
             if "name" in chain.keys():
                  sequence_data[entity_type]["ccd"] = chain["name"]
             if "smiles" in chain.keys():