fix bugs with text, bgimage, and saving

text no longer fails for empty strings
bgimage now checks if the path exists
saving now saves the last instruction

src/images.moon

@@ -8,7 +8,7 @@ on "save", =>
 	@images = _.map(images, => {path: @path, x: @x, y: @y})
 
 on "restore", =>
-	dispatch "bgload", @background
+	if @background.path != nil then dispatch "bgload", @background
 	for image in *@images do dispatch "setimg", image
 
 first_bg = true

src/script.moon

@@ -5,7 +5,7 @@ load = (base_dir, fs, data = file: "main.scr") ->
 	s = {:base_dir, :fs, locals: {}, globals: {}}
 	s = _.extend(s, read_file(s, data.file))
 	_.extend(s, data)
-save = (s) -> {file: s.file, locals: s.locals, globals: s.globals, n: s.n-2}
+save = (s) -> {file: s.file, locals: s.locals, globals: s.globals, n: s.n-1}
 mem = (s, key) -> s.locals if s.locals[key] ~= nil else s.globals
 mem_type = (s, type) -> s.locals if type == "setvar" else s.globals
 choose = (s, val) -> s.locals["selected"] = val

src/text.moon

@@ -10,6 +10,7 @@ on "choose", => focused = false
 on "text", =>
 	focused = true
 	no_input = false
+	if @text == '' then return
 	if @text\sub(1, 1) == "@"
 		@text = @text\sub(2, -1)
 		no_input = true