improve error report [#27775] External Image Editor Preference does not work

also correct tooltip typo.

release/scripts/startup/bl_operators/image.py

@@ -60,7 +60,7 @@ class EditExternally(bpy.types.Operator):
         filepath = bpy.path.abspath(self.filepath)
 
         if not os.path.exists(filepath):
-            self.report({'ERROR'}, "Image path %r not found." % filepath)
+            self.report({'ERROR'}, "Image path %r not found, image may be packed or unsaved." % filepath)
             return {'CANCELLED'}
 
         cmd = self._editor_guess(context) + [filepath]

source/blender/editors/object/object_edit.c

@@ -1704,7 +1704,7 @@ void OBJECT_OT_shade_smooth(wmOperatorType *ot)
 {
 	/* identifiers */
 	ot->name= "Shade Smooth";
-	ot->description= "Display faces 'smooth' (using vertext normals)";
+	ot->description= "Display faces 'smooth' (using vertex normals)";
 	ot->idname= "OBJECT_OT_shade_smooth";
 	
 	/* api callbacks */