Preserve error message in OpenOS error handling (#3767)

Author: kcinnaJlol

src/main/resources/assets/opencomputers/loot/openos/lib/process.lua

@@ -68,15 +68,15 @@ function process.load(path, env, init, name)
           if type(msg) == "table" and msg.reason == "terminated" then
             return msg.code or 0
           end
-          return debug.traceback()
+          return {msg, debug.traceback()}
         end, ...)
     }
 
-    if not result[1] and type(result[2]) ~= "number" then
+    if not result[1] and type(result[2]) == "table" then
       -- run exception handler
       xpcall(function()
-          local stack = result[2]:gsub("^([^\n]*\n)[^\n]*\n[^\n]*\n","%1")
-          io.stderr:write(string.format("%s:\n%s", msg or "", stack))
+          local stack = result[2][2]:gsub("^([^\n]*\n)[^\n]*\n[^\n]*\n","%1")
+          io.stderr:write(string.format("%s:\n%s", result[2][1] or "", stack))
         end,
         function(msg)
           io.stderr:write("process library exception handler crashed: ", tostring(msg))