Fix some noisy tracebacks in the UI draw code

korman/ui/ui_image.py

@@ -20,6 +20,6 @@ class PlasmaImageEditorHeader(bpy.types.Header):
 
     def draw(self, context):
         layout, image = self.layout, context.space_data.image
+        if image is not None:
             settings = image.plasma_image
-
             layout.prop(settings, "texcache_method", text="")

korman/ui/ui_texture.py

@@ -55,14 +55,15 @@ class PlasmaLayerPanel(TextureButtonsPanel, bpy.types.Panel):
     bl_label = "Plasma Layer Options"
 
     def draw(self, context):
-        texture, slot = context.texture, context.texture_slot
+        texture, slot = context.texture, getattr(context, "texture_slot", None)
+        use_stencil = slot.use_stencil if slot is not None else False
         layer_props = texture.plasma_layer
         layout = self.layout
 
         split = layout.split()
         col = split.column()
         col.label("Animation:")
-        col.active = self._has_animation_data(context) and not slot.use_stencil
+        col.active = self._has_animation_data(context) and not use_stencil
         col.prop(layer_props, "anim_auto_start")
         col.prop(layer_props, "anim_loop")
         col.separator()
@@ -71,7 +72,7 @@ class PlasmaLayerPanel(TextureButtonsPanel, bpy.types.Panel):
 
         col = split.column()
         col.label("Miscellaneous:")
-        col.active = not slot.use_stencil
+        col.active = not use_stencil
         col.prop(layer_props, "opacity", text="Opacity")
         col.separator()