[Bf-blender-cvs] [1a8642937dd] master: Fix T72272: Error setting tool in weight paint mode

[Campbell Barton]

Commit: 1a8642937dde9b323f055a26a00ece1c3ff6b0e8
Author: Campbell Barton
Date:   Tue Dec 10 08:15:43 2019 +1100
Branches: master
https://developer.blender.org/rB1a8642937dde9b323f055a26a00ece1c3ff6b0e8

Fix T72272: Error setting tool in weight paint mode

Error from recent fallback tool support.

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M	release/scripts/startup/bl_ui/space_toolsystem_common.py

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diff --git a/release/scripts/startup/bl_ui/space_toolsystem_common.py b/release/scripts/startup/bl_ui/space_toolsystem_common.py
index 6668b261b33..01bd6dc3068 100644
--- a/release/scripts/startup/bl_ui/space_toolsystem_common.py
+++ b/release/scripts/startup/bl_ui/space_toolsystem_common.py
@@ -913,7 +913,7 @@ def _activate_by_item(context, space_type, item, index, *, as_fallback=False):
         index=index,
 
         idname_fallback=item_fallback.idname if item_fallback else "",
-        keymap_fallback=(item_fallback.keymap[0] or "") if item_fallback else "",
+        keymap_fallback=item_fallback.keymap[0] if (item_fallback and item_fallback.keymap) else "",
     )
 
     WindowManager = bpy.types.WindowManager