Using MLA bibliography format causes block #quote with bibliography entry label in attribution field to display empty parenthesis

When using the "mla" style for #bibliography, using a label from a bibliography entry for the #quote function's attribution field causes empty parenthesis to be display. A fix would be to not display parenthesis. I am unaware of the underlying implementation but I assume that inserting parenthesis could be changed to be controlled by whether the style format renders dates for quotations (information that already be available/present as the #cite function correctly chooses to render dates or not)

Below are images comparing between "mla" and "apa" style using the #cite function first, followed by #quote

Here is an example of using the "mla" style, please note that not displaying the date is correct for MLA formatted quotations

And here is an example of using the "apa" style

Start by reproducing the MLA and APA examples using #bibliography, #cite, and #quote, focusing on an entry label supplied as the attribution. Trace how quotation attribution formatting differs from citation formatting. Done means MLA quotations with labels that render no date no longer show empty parentheses, while APA behavior remains correct.