fix generate first video slug

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apps/core/models.py

@@ -93,8 +93,7 @@ class Video(BaseModel):
         return self.title
 
     def save(self, *args, **kwargs):
-        print('save')
-        if not self.id:
+        if not self.slug:
             self.slug = slugify(self.title)
 
         super().save(*args, **kwargs)