Fix missing implementation for null event

Author: tustanivsky

plugin-dev/Source/Sentry/Private/Null/NullSentryEvent.h

@@ -14,6 +14,8 @@ class FNullSentryEvent final : public ISentryEvent
 	virtual FString GetMessage() const override { return TEXT(""); }
 	virtual void SetLevel(ESentryLevel level) override {}
 	virtual ESentryLevel GetLevel() const override { return ESentryLevel::Debug; }
+	virtual void SetFingerprint(const TArray<FString>& fingerprint) override {}
+	virtual TArray<FString> GetFingerprint() override { return TArray<FString>(); }
 	virtual bool IsCrash() const override { return false; }
 	virtual bool IsAnr() const override { return false; }
 };