fix: Allow reactions to be added to an existing comment without providing message

Skip issues.updateComment call if no message was provided.

Author: jwarby

src/main.ts

@@ -93,12 +93,14 @@ async function run() {
       comment_id: number;
       body: string;
     }) {
-      const { data: comment } = await octokit.rest.issues.updateComment({
-        owner,
-        repo,
-        comment_id,
-        body,
-      });
+      if (body) {
+        const { data: comment } = await octokit.rest.issues.updateComment({
+          owner,
+          repo,
+          comment_id,
+          body,
+        });
+      }
 
       core.setOutput('id', comment.id);
       core.setOutput('body', comment.body);