Fast Skip crashes in Ren'Py demo

[Jake Staines]

Fast Skip (>) crashes with the following traceback if used in the Ren'Py tutorial demo at any point before the code-example popup is shown. For example, if you select 'Writing Dialogue' from the demo menu and then hit > at the next opportunity, Ren'Py crashes. Reproduced on latest 6.12 and 6.13.0.1589 prerelease.

I'm sorry, but an uncaught exception occurred.

Executing ATL code at tutorial/game/examples.rpy:23
  File "tutorial/game/script.rpy", line 115, in script call
            call expression _return
  File "tutorial/game/tutorial_quickstart.rpy", line 30, in script
        hide example
TypeError: zip argument #1 must support iteration

-- Full Traceback ------------------------------------------------------------

Full traceback:
  File "/Users/jake/Code/renpy-6.13.0/renpy/execution.py", line 261, in run
  File "/Users/jake/Code/renpy-6.13.0/renpy/ast.py", line 963, in execute
  File "/Users/jake/Code/renpy-6.13.0/renpy/exports.py", line 301, in hide
  File "/Users/jake/Code/renpy-6.13.0/renpy/display/core.py", line 824, in remove
  File "/Users/jake/Code/renpy-6.13.0/renpy/display/core.py", line 752, in hide_or_replace
  File "/Users/jake/Code/renpy-6.13.0/renpy/display/image.py", line 146, in _hide
  File "/Users/jake/Code/renpy-6.13.0/renpy/display/motion.py", line 647, in _hide
  File "/Users/jake/Code/renpy-6.13.0/renpy/atl.py", line 371, in execute
  File "/Users/jake/Code/renpy-6.13.0/renpy/atl.py", line 536, in execute
  File "/Users/jake/Code/renpy-6.13.0/renpy/atl.py", line 1180, in execute
  File "/Users/jake/Code/renpy-6.13.0/renpy/atl.py", line 536, in execute
  File "/Users/jake/Code/renpy-6.13.0/renpy/atl.py", line 920, in execute
  File "/Users/jake/Code/renpy-6.13.0/renpy/atl.py", line 119, in interpolate
TypeError: zip argument #1 must support iteration

Darwin-10.4.0-i386-32bit
Ren'Py 6.13.0.1589
Ren'Py Tutorial 6.13 "Low-Carb"

[Tom Rothamel (renpytom)]

Turned out to be a problem with ATL interpolation, coupled with the game going by too fast. Fixed.