Blender toggle rest/pose armature

bl_info = {
    "name": "Rest/Pose Toggle",
    "description": "Re-assignable hotkey for toggling between rest and pose for selected armature.",
    "author": "Ferdinand Joseph Fernandez",
    "version": (1, 0),
    "location": "Shift Q while in 3d View",
    "support": "TESTING",
    "category": "Animation",
}

import bpy

class RestPoseToggle(bpy.types.Operator):
    """Rest/Pose Toggle"""
    bl_idname = "animation.rest_pose_toggle"
    bl_label = "Rest/Pose Toggle"
    bl_options = {'REGISTER', 'UNDO'}

    def execute(self, context):
        ob = context.object

        if ob.type == 'ARMATURE':
            armature = ob.data

            if armature.pose_position == 'POSE':
                armature.pose_position = 'REST'
            else:
                armature.pose_position = 'POSE'

        return {'FINISHED'}

# store keymaps here to access after registration
addon_keymaps = []

def register():
    bpy.utils.register_class(RestPoseToggle)

    # hotkey registration
    wm = bpy.context.window_manager
    km = wm.keyconfigs.addon.keymaps.new(name='Pose', space_type='EMPTY')
    kmi = km.keymap_items.new(RestPoseToggle.bl_idname, 'Q', 'PRESS', shift=True)

    # add to list so we can unregister afterwards
    addon_keymaps.append(km)

def unregister():
    bpy.utils.unregister_class(RestPoseToggle)

    # unregister hotkey
    wm = bpy.context.window_manager
    for km in addon_keymaps:
        wm.keyconfigs.addon.keymaps.remove(km)

    # clear the list
    addon_keymaps.clear()

if __name__ == "__main__":
    register()