adding test for body-less while, using null as the body so JSLint doesn't get in a tizzy

lib/coffee_script/nodes.rb

@@ -609,7 +609,7 @@ module CoffeeScript
       o[:top]     = true
       cond        = @condition.compile(o)
       post        = returns ? "\n#{idt}return null;" : ''
-      return write("#{idt}while (#{cond});#{post}") if @body.nil?
+      return write("#{idt}while (#{cond}) null;#{post}") if @body.nil?
       write("#{idt}while (#{cond}) {\n#{@body.compile(o)}\n#{idt}}#{post}")
     end
   end

test/fixtures/execution/test_literals.coffee

@@ -23,4 +23,10 @@ print(func() is null)
 str: "\\"
 reg: /\\/
 
-print(reg(str) and str is '\\')
+print(reg(str) and str is '\\')
+
+
+i: 10
+while i -= 1
+
+print(i is 0)