only attempt to print if we know it exists

Author: Janther

src/slang-nodes/YulFunctionDefinition.ts

@@ -50,7 +50,7 @@ export class YulFunctionDefinition implements SlangNode {
       'function ',
       path.call(print, 'name'),
       path.call(print, 'parameters'),
-      path.call(print, 'returns') || ' ',
+      this.returns ? path.call(print, 'returns') : ' ',
       path.call(print, 'body')
     ];
   }