qrcode: fix account qr code generation

The current account id is passed to the qr image provider but is
interpreted as a model index.

Change-Id: I5e2a94d5d02d07daa4826315a5d76925e80f033e
Gitlab: #490

src/qrimageprovider.h

@@ -78,15 +78,14 @@ public:
         } else {
             if (indexPair.second.isEmpty())
                 return QImage();
-
-            auto accountList = lrcInstance_->accountModel().getAccountList();
-            auto accountIndex = indexPair.second.toInt();
-            if (accountList.size() <= accountIndex)
-                return QImage();
-
-            auto& accountInfo = lrcInstance_->accountModel().getAccountInfo(
-                accountList.at(accountIndex));
+            auto accountId = indexPair.second;
+            try {
+                auto& accountInfo = lrcInstance_->getAccountInfo(accountId);
                 uri = accountInfo.profileInfo.uri;
+            } catch (const std::out_of_range&) {
+                qWarning() << "Couldn't get account info for id:" << accountId;
+                return QImage();
+            }
         }
 
         if (!requestedSize.isEmpty())