fix for updating profile with empty bio

app/services/user.js

@@ -123,7 +123,9 @@ class UserService {
     const username_lc = userDefinition.username.toLowerCase();
 
     userDefinition.displayName = striptags(userDefinition.displayName.trim());
+    if (userDefinition.bio) {
       userDefinition.bio = striptags(userDefinition.bio.trim());
+    }
 
     this.log.info('updating user', { userDefinition });
     await User.updateOne(