Bottom Lane space
 

I am having a brain freeze on what the correct procedure is on if the non shooting team fails to occupy the bottom lane space. If anyone can give me the correct ruling that would be great.
Since my game got canceled, I went and watched the only game being played in town. During the first half they had no one in the bottom space for the first free throw. They gave the arm out signal for violation then dropped it after the make. I just couldn't think of the who procedure.

There's was incorrect.
Get them in there, don't administer the free throw without it. If they refuse, you can issue a T. In that case, they no longer have to occupy. :)

The RPP is used after timeouts.

10.1.5 stich C should help. Good call LDUB on resuming of play procedure. That is when the OP would be correct, for the first shot anyway.

Be Careful Here, Not Only After Time Outs ...
 

... and when the throwin team does not make a thrower available.

Not Just Mere Threads; Lessons for Life
 

I had this exact sitch last week. I didn't bother to thoroughly study the discussion board conclusion on this precise situation when it was posted that very day prior to my game.
When the defense didn't provide players in the bottom two boxes, I erringly issued a warning for delay of game. That worked, and neither of the coaches disgreed at all, but it wasn't the correct procedure.
Only after I got home that night did I study the discussion board responses which correctly stated that I should have "directed them" to fill those spaces, or else I would have had to issue a T, as above references verify.
No one else in the gym knew whether I was right or wrong, but I should have made the right call for the situation. Now I know.
Lesson Here: Study the discussion board responses thoroughly. This was the third time this year that a response expressed in a thread was relevant to a game situation in which I was involved soon thereafter. If you are a contributor here, I thank you for your part in this beneficial process.