Guideline through Selected Nodes.py

#MenuTitle: Guideline through Selected Nodes
# -*- coding: utf-8 -*-
__doc__="""
Creates a guideline through the currently selected two nodes.
"""

import GlyphsApp
import math

Font = Glyphs.font
selectedLayer = Font.selectedLayers[0]

try:
	# until v2.1:
	selection = selectedLayer.selection()
except:
	# since v2.2:
	selection = selectedLayer.selection


if len( selection ) == 2:
	firstPoint = selection[0]
	secondPoint = selection[1]
	xDiff = firstPoint.x - secondPoint.x
	
	myGuideline = GSGuideLine()
	myGuideline.position = NSPoint( firstPoint.x, firstPoint.y )
	
	if xDiff != 0.0:
		tangens = (firstPoint.y - secondPoint.y) / xDiff
		myGuideline.angle = math.atan( tangens ) * 180.0 / math.pi
	else:
		myGuideline.angle = 90

	selectedLayer.addGuideLine_( myGuideline )
	selectedLayer.setSelection_(NSMutableArray.arrayWithObject_(myGuideline))

closing parenthesis missing in L36
wrong indentation from L30 to the end

@mekkablue Whao that's weird...since the script used to work even like this. What should the indentation be?
Just tried it now with this new revision and it crashes right away,