DebuggerKitInformation: Handle null QVariants

Change-Id: Iac2b3fde2d7357d8c00db05ed4ad39e6b5a861e9
Reviewed-by: Eike Ziller <eike.ziller@digia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>

src/plugins/debugger/debuggerkitinformation.cpp

@@ -296,6 +296,8 @@ static const char binaryKeyC[] = "Binary";
 DebuggerKitInformation::DebuggerItem DebuggerKitInformation::variantToItem(const QVariant &v)
 {
     DebuggerItem result;
+    if (v.isNull())
+        return result;
     if (v.type() == QVariant::String) { // Convert legacy config items, remove later.
         const QString binary = v.toString();
         result.binary = Utils::FileName::fromString(binary);