fix(sketcher): allow empty input to be saved

Author: OliverDudgeon

components/SMILESInput.tsx

@@ -146,7 +146,8 @@ export const SMILESInput = ({
             const ketcher = global.ketcher;
             try {
               const smi = await ketcher?.getSmiles();
-              if (smi) {
+              console.log(smi);
+              if (smi !== undefined) {
                 setSmiles(smi);
                 setMode("smiles");
                 onSave(smi);