Fix T48089: Animation won't export to FBX in case active action is read-only (some NLA usages).

Skip 'all actions' options for those objects...

io_scene_fbx/__init__.py

@@ -21,8 +21,8 @@
 bl_info = {
     "name": "FBX format",
     "author": "Campbell Barton, Bastien Montagne, Jens Restemeier",
-    "version": (3, 7, 1),
-    "blender": (2, 76, 0),
+    "version": (3, 7, 2),
+    "blender": (2, 77, 0),
     "location": "File > Import-Export",
     "description": "FBX IO meshes, UV's, vertex colors, materials, textures, cameras, lamps and actions",
     "warning": "",

io_scene_fbx/export_fbx_bin.py

@@ -2060,6 +2060,9 @@ def fbx_animations(scene_data):
             if not ob.animation_data:
                 continue  # Do not export animations for objects that are absolutely not animated, see T44386.
 
+            if ob.animation_data.is_property_readonly('action'):
+                continue  # Cannot re-assign 'active action' to this object (usually related to NLA usage, see T48089).
+
             # We can't play with animdata and actions and get back to org state easily.
             # So we have to add a temp copy of the object to the scene, animate it, and remove it... :/
             ob_copy = ob.copy()