FBX IO: Fix error importing transformation animations with a single channel

The second return value of _combine_curve_keyframe_times is supposed to
be a list of arrays, but when there was only a single input array, that
array was being returned directly, without putting it in a list.

This fixes an unreported mistake in abab1c9343.

io_scene_fbx/__init__.py

@@ -5,7 +5,7 @@
 bl_info = {
     "name": "FBX format",
     "author": "Campbell Barton, Bastien Montagne, Jens Restemeier, @Mysteryem",
-    "version": (5, 7, 0),
+    "version": (5, 7, 1),
     "blender": (3, 6, 0),
     "location": "File > Import-Export",
     "description": "FBX IO meshes, UVs, vertex colors, materials, textures, cameras, lamps and actions",

io_scene_fbx/import_fbx.py

@@ -668,7 +668,8 @@ def _combine_curve_keyframe_times(times_and_values_tuples, initial_values):
     interpolating the keyframe values is a TODO."""
     if len(times_and_values_tuples) == 1:
         # Nothing to do when there is only a single curve.
-        return times_and_values_tuples[0]
+        times, values = times_and_values_tuples[0]
+        return times, [values]
 
     all_times = [t[0] for t in times_and_values_tuples]