shorter form of setting uninitialized value

Co-authored-by: Jan Romann <jan.romann@uni-bremen.de>

Author: danielpeintner

packages/core/src/consumed-thing.ts

@@ -566,7 +566,7 @@ export default class ConsumedThing extends TD.Thing implements IConsumedThing {
         outputDataSchema: WoT.DataSchema | undefined
     ): InteractionOutput {
         // infer media type from form if not in response metadata
-        if (!content.type) content.type = form.contentType ?? "application/json";
+        content.type ??= form.contentType ?? "application/json";
 
         // check if returned media type is the same as expected media type (from TD)
         if (form.response != null) {