Fix #640 - don't add muid-0 cards to splitCards map

oracle/src/oracleimporter.cpp

@@ -187,6 +187,7 @@ int OracleImporter::importTextSpoiler(CardSet *set, const QVariant &data)
                 // add first card's data
                 cardName = card1->contains("name") ? card1->value("name").toString() : QString("");
                 cardCost = card1->contains("manaCost") ? card1->value("manaCost").toString() : QString("");
+                cmc = card1->contains("cmc") ? card1->value("cmc").toString() : QString("");
                 cardType = card1->contains("type") ? card1->value("type").toString() : QString("");
                 cardPT = card1->contains("power") || card1->contains("toughness") ? card1->value("power").toString() + QString('/') + card1->value("toughness").toString() : QString("");
                 cardText = card1->contains("text") ? card1->value("text").toString() : QString("");
@@ -199,8 +200,10 @@ int OracleImporter::importTextSpoiler(CardSet *set, const QVariant &data)
                 cardPT += card2->contains("power") || card2->contains("toughness") ? QString(" // ") + card2->value("power").toString() + QString('/') + card2->value("toughness").toString() : QString("");
                 cardText += card2->contains("text") ? QString("\n\n---\n\n") + card2->value("text").toString() : QString("");
             } else {
-                // first card od a pair; enqueue for later merging
-                splitCards.insert(cardId, map);
+                // first card of a pair; enqueue for later merging
+                // Conditional on cardId because promo prints have no muid - see #640
+                if (cardId)
+                  splitCards.insert(cardId, map);
                 continue;
             }
         } else {