Fixed crash on load.

Fixed dll crash on load by adding a check if the Json file exists or not.

dll/item_db_loader.cpp

@@ -24,10 +24,15 @@ std::map<SteamItemDef_t, std::map<std::string, std::string>> read_items_db(std::
     std::map<SteamItemDef_t, std::map<std::string, std::string>> items;
    
     std::ifstream items_file(items_db);
+    // If there is a file and we opened it
+    if( items_file )
+    {
         items_file.seekg(0, std::ios::end);
         size_t size = items_file.tellg();
         std::string buffer(size, '\0');
         items_file.seekg(0);
+        // Read it entirely, if the .json file gets too big,
+        // I should look into this and split reads into smaller parts.
         items_file.read(&buffer[0], size); 
         items_file.close();
 
@@ -40,7 +45,7 @@ std::map<SteamItemDef_t, std::map<std::string, std::string>> read_items_db(std::
             {
                 SteamItemDef_t key = std::stoi((*i).key());
                 nlohmann::json& value = (*i).value();
-            for( auto& j : value.items() )
+                for (auto& j : value.items())
                 {
                     tmp[key][(*j).key()] = (*j).value();
                 }
@@ -52,6 +57,7 @@ std::map<SteamItemDef_t, std::map<std::string, std::string>> read_items_db(std::
         {
             PRINT_DEBUG("Error while parsing json: %s", e.what());
         }
+    }
 
     return items;
 }

dll/steam_inventory.h

@@ -87,7 +87,7 @@ struct Steam_Inventory_Requests *get_inventory_result(SteamInventoryResult_t res
 public:
 
 Steam_Inventory(class Settings *settings, class SteamCallResults *callback_results, class SteamCallBacks *callbacks):
-    items(read_items_db(Local_Storage::get_program_path() + PATH_SEPARATOR + "steam_items.json"))
+    items(std::move(read_items_db(Local_Storage::get_program_path() + PATH_SEPARATOR + "steam_items.json")))
 {
     this->settings = settings;
     this->callbacks = callbacks;