Don’t take my word for it. Form 4473 background check form does read:
“Are you under indictment or information in any court for a felony, or any other crime for which the judge could imprison you for more than one year”.
"Indictment means that you went before a grand jury and the grand jury found sufficient evidence to charge you with a crime.
Information is similar to indictment except that instead of a grand jury, an officer of the court such as a prosecutor determines there is sufficient evidence to charge you with a crime.
Since you did not go before a grand jury, there was no indictment.
There was no information because you did not go to court and the charges were dropped.
Therefore, you can answer NO to the question. You can also answer NO because the question is present tense, asking if you are (now) under indictment or information."
Cornell University Law School website describes “indictment or information” in this link below:
Help wanted: Lawyers.
My 2 cents: A background check only costs me $5 bucks, which so far, I can afford. I had previously thought about your same question, so I saved up and have reserves “meaning- back firearms at home” (so less worry), God-forbid I lose my main one to the police after a self-defense of life/limb shooting.