Added empty string check.

nomsu.lua

@@ -424,6 +424,9 @@ do
       if max_operations == nil then
         max_operations = nil
       end
+      if src == "" then
+        return nil, "", vars
+      end
       if max_operations then
         local timeout
         timeout = function()

nomsu.moon

@@ -323,6 +323,7 @@ class NomsuCompiler
         return tree
 
     run: (src, filename, vars={}, max_operations=nil)=>
+        if src == "" then return nil, "", vars
         if max_operations
             timeout = ->
                 debug.sethook!