GH-1697 always stale files tolerate errors if a local copy is present

This fixes the situation when liteloader snapshot site is broken
and there's an older local snapshot already present.

api/logic/net/ByteArraySink.h

@@ -51,6 +51,11 @@ public:
 		return Job_Failed;
 	}
 
+	bool hasLocalData() override
+	{
+		return false;
+	}
+
 private:
 	QByteArray * m_output;
 };