You couldn't find information on the saint I requested. Does the Satcharitra explain what a devotee should do when the text seems to be missing something?

Yes, Chapter 50 addresses this very situation, though indirectly. Hemadpant humbly states that he is merely a 'nominal cause' for the book and that 'there is no one other than Sai who makes the words speak.' He urges the reader not to get caught up in specifics but to focus on their own spiritual welfare. When a name is not found, the devotee is encouraged to remember that Sai is the true listener, the act of hearing, and the thing to be heard. As Chapter 50 explains, maintaining this 'unbroken' oneness is the supreme goal, purifying the heart far more than any single story might.