Fix runCommand crash, return output and result

library/LuaApi.cpp

@@ -2230,18 +2230,15 @@ static int internal_getDir(lua_State *L)
 
 static int internal_runCommand(lua_State *L)
 {
-    CoreSuspender suspend;
     luaL_checktype(L, 1, LUA_TSTRING);
+    CoreSuspender suspend;
     std::string command = lua_tostring(L, 1);
     buffered_color_ostream out;
     command_result res = Core::getInstance().runCommand(out, command);
-    if (res != CR_OK)
-    {
-        lua_pushinteger(L, (int)res);
-        return 1;
-    }
     auto fragments = out.fragments();
     lua_newtable(L);
+    lua_pushinteger(L, (int)res);
+    lua_setfield(L, -2, "status");
     int i = 1;
     for (auto iter = fragments.begin(); iter != fragments.end(); iter++, i++)
     {

library/lua/dfhack.lua

@@ -374,14 +374,13 @@ function dfhack.run_command(...)
         command = table.concat(args, ' ')
     end
     result = internal.runCommand(command)
-    if type(result) == 'number' then
-        return result
-    end
     output = ""
     for i, f in pairs(result) do
-        output = output .. f[2]
+        if type(f) == 'table' then
+            output = output .. f[2]
+        end
     end
-    return output
+    return output, result.status
 end
 
 -- Per-save init file