Update null classes so that they compile for platform extensions

Author: nwhite-riot

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

@@ -7,6 +7,8 @@
 class FNullSentryId final : public ISentryId
 {
 public:
+	FNullSentryId(const FString& Id) = default;
+
 	virtual ~FNullSentryId() override = default;
 
 	virtual FString ToString() const override { return TEXT(""); }

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

@@ -11,6 +11,7 @@ class FNullSentryScope final : public ISentryScope
 
 	virtual void AddBreadcrumb(TSharedPtr<ISentryBreadcrumb> breadcrumb) override {}
 	virtual void ClearBreadcrumbs() override {}
+	virtual void AddAttachment(TSharedPtr<ISentryAttachment> attachment) override {}
 	virtual void ClearAttachments() override {}
 	virtual void SetTagValue(const FString& key, const FString& value) override {}
 	virtual FString GetTagValue(const FString& key) const override { return TEXT(""); }