Correct. No blank line is necessary if the attribution is embedded on the same line as the quote, etc.

But anytime that source/attribution information is blocked, you must insert the blank line following it.

I want to be helpful but must caution you that this forum is for understanding the Braille Formats code and applying it to transcriptions. It is not always helpful for students in the basic literary course. The LOC course book is not a rule book. There may be requirements in the LOC that are not necessarily applied when later following Braille Formats.

Follow your grader’s instructions and read your lesson exercise instructions carefully. They sometimes include clues or direct you to do certain things–like adding blank lines when ordinarily blank lines are not inserted.