fix(stream): segfault for datastream with no reader

This should fix a whole lot of things never being able to run cleanup.

src/core/rootwrapper.cpp

@@ -26,6 +26,11 @@ RootWrapper::RootWrapper(QString rootPath)
 	}
 }
 
+RootWrapper::~RootWrapper() {
+	// event loop may no longer be running so deleteLater is not an option
+	delete this->root;
+}
+
 void RootWrapper::reloadGraph(bool hard) {
 	if (this->root != nullptr) {
 		this->engine.clearComponentCache();

src/core/rootwrapper.hpp

@@ -2,6 +2,7 @@
 
 #include <qobject.h>
 #include <qqmlengine.h>
+#include <qtclasshelpermacros.h>
 #include <qtmetamacros.h>
 #include <qurl.h>
 
@@ -13,6 +14,8 @@ class RootWrapper: public QObject {
 
 public:
 	explicit RootWrapper(QString rootPath);
+	~RootWrapper() override;
+	Q_DISABLE_COPY_MOVE(RootWrapper);
 
 	void reloadGraph(bool hard);
 

src/io/datastream.cpp

@@ -35,6 +35,7 @@ void DataStream::onReaderDestroyed() {
 }
 
 void DataStream::onBytesAvailable() {
+	if (this->mReader == nullptr) return;
 	auto buf = this->ioDevice()->readAll();
 	this->mReader->parseBytes(buf, this->buffer);
 }