Merge pull request #20456 from edx/asad/PROD-230-logs

updated logs

common/lib/xmodule/xmodule/library_content_module.py

@@ -303,7 +303,7 @@ class LibraryContentModule(LibraryContentFields, XModule, StudioEditableModule):
         for block_type, block_id in self.selected_children():
             child = self.runtime.get_block(self.location.course_key.make_usage_key(block_type, block_id))
             if child is None:
-                logger.info("Child not found for [%s] [%s]".format(str(block_type), str(block_id)))
+                logger.info("Child not found for {} {}".format(str(block_type), str(block_id)))
             yield child
 
     def student_view(self, context):