Reverted error handling of tab restoration

The change in #1048 prevented opening of blank tab and urls that are no longer valid. Now, we will need to open them as well, as we will need the exact number of tabs to reopen in order to correctly restore current tab index.

src/kiwixapp.cpp

@@ -207,13 +207,7 @@ void KiwixApp::restoreTabs()
     {
       for (const auto &zimUrl : tabsToOpen)
       {
-        try
-        {
-          /* Throws exception if zim file cannot be found */
-          m_library.getArchive(QUrl(zimUrl).host().split('.')[0]);
-          openUrl(QUrl(zimUrl));
-        }
-        catch (std::exception &e) { /* Blank */ }
+        openUrl(QUrl(zimUrl));
       }
     }
 }