fix: json bug on struct input

Signed-off-by: Pianist038801 <[email protected]>

src/components/Launch/LaunchForm/StructInput.tsx

@@ -76,7 +76,7 @@ export const StructInput: React.FC<InputProps> = props => {
     }
 
     const [paramData, setParamData] = useState(
-        jsonFormRenderable ? JSON.parse(value as string) : {}
+        jsonFormRenderable && value ? JSON.parse(value as string) : {}
     );
 
     const onFormChange = ({ formData }, e) => {