[Bf-blender-cvs] [d3275178fe3] blender-v2.83-release: Fix T77082: Greasepencil error accessing material dropdown on an object without materials

[Philipp Oeser]

Commit: d3275178fe329d91e27fd42c689de2254b946882
Author: Philipp Oeser
Date:   Tue May 26 10:57:06 2020 +0200
Branches: blender-v2.83-release
https://developer.blender.org/rBd3275178fe329d91e27fd42c689de2254b946882

Fix T77082: Greasepencil error accessing material dropdown on an object without materials

Differential Revision: https://developer.blender.org/D7841

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

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diff --git a/release/scripts/startup/bl_ui/properties_grease_pencil_common.py b/release/scripts/startup/bl_ui/properties_grease_pencil_common.py
index 8b02f858b65..6a94212fb81 100644
--- a/release/scripts/startup/bl_ui/properties_grease_pencil_common.py
+++ b/release/scripts/startup/bl_ui/properties_grease_pencil_common.py
@@ -639,7 +639,7 @@ class GreasePencilMaterialsPanel:
             if is_view3d and brush is not None:
                 gp_settings = brush.gpencil_settings
                 if gp_settings.use_material_pin is False:
-                    if ob.active_material_index >= 0:
+                    if len(ob.material_slots) > 0 and ob.active_material_index >= 0:
                         ma = ob.material_slots[ob.active_material_index].material
                 else:
                     ma = gp_settings.material