Fix compiler warining non-virtual destructor

ref:
https://stackoverflow.com/questions/38407723/how-to-delete-an-object-of-derived-class-that-has-no-dstructor

sources/properties/propertiesinterface.cpp

@@ -20,3 +20,8 @@
 PropertiesInterface::PropertiesInterface()
 {
 }
+
+PropertiesInterface::~PropertiesInterface()
+{
+
+}

sources/properties/propertiesinterface.h

@@ -30,6 +30,7 @@ class PropertiesInterface
 {
 	public:
 	PropertiesInterface();
+	virtual ~PropertiesInterface();
 	// Save/load properties to setting file. QString is use for prefix a word befor the name of each paramètre
 	virtual void toSettings	  (QSettings &settings, const QString = QString()) const =0;
 	virtual void fromSettings (const QSettings &settings, const QString = QString()) =0;

sources/qetdiagrameditor.cpp

@@ -2220,19 +2220,19 @@ void QETDiagramEditor::generateTerminalBlock()
 		success = process->startDetached("qet_tb_generator", {(QETDiagramEditor::currentProjectView()->project()->filePath())});
 	}
 	else  {
-		success = process->startDetached("qet_tb_generator", {("")});
+		success = process->startDetached("qet_tb_generator");
 	}
 	if (openedProjects().count()){
 		success = process->startDetached(QDir::homePath() + "/Application Data/qet/qet_tb_generator.exe", {(QETDiagramEditor::currentProjectView()->project()->filePath())});
 	}
 	else  {
-		success = process->startDetached(QDir::homePath() + "/Application Data/qet/qet_tb_generator.exe", {("")});
+		success = process->startDetached(QDir::homePath() + "/Application Data/qet/qet_tb_generator.exe");
 	}
 	if (openedProjects().count()){
 		success = process->startDetached(QDir::homePath() + "/qet_tb_generator.exe", {(QETDiagramEditor::currentProjectView()->project()->filePath())});
 	}
 	else  {
-		success = process->startDetached(QDir::homePath() + "/qet_tb_generator.exe", {("")});
+		success = process->startDetached(QDir::homePath() + "/qet_tb_generator.exe");
 	}
 
 #elif  defined(Q_OS_MAC)
@@ -2240,13 +2240,13 @@ void QETDiagramEditor::generateTerminalBlock()
 		success = process->startDetached("/Library/Frameworks/Python.framework/Versions/3.8/bin/qet_tb_generator", {(QETDiagramEditor::currentProjectView()->project()->filePath())});
 	}
 	else  {
-		success = process->startDetached("/Library/Frameworks/Python.framework/Versions/3.8/bin/qet_tb_generator", {("")});
+		success = process->startDetached("/Library/Frameworks/Python.framework/Versions/3.8/bin/qet_tb_generator");
 	}
 		if (openedProjects().count()){
 		success = process->startDetached(QDir::homePath() + "/.qet/qet_tb_generator.app", {(QETDiagramEditor::currentProjectView()->project()->filePath())});
 	}
 	else  {
-		success = process->startDetached(QDir::homePath() + "/.qet/qet_tb_generator.app", {("")});
+		success = process->startDetached(QDir::homePath() + "/.qet/qet_tb_generator.app");
 	}
 	
 #else
@@ -2254,13 +2254,13 @@ void QETDiagramEditor::generateTerminalBlock()
 		success = process->startDetached("qet_tb_generator", {(QETDiagramEditor::currentProjectView()->project()->filePath())});
 	}
 	else  {
-		success = process->startDetached("qet_tb_generator", {("")});
+		success = process->startDetached("qet_tb_generator");
 	}
 	if (openedProjects().count()){
 		success = process->startDetached(QDir::homePath() + "/.qet/qet_tb_generator", {(QETDiagramEditor::currentProjectView()->project()->filePath())});
 	}
 	else  {
-		success = process->startDetached(QDir::homePath() + "/.qet/qet_tb_generator", {("")});
+		success = process->startDetached(QDir::homePath() + "/.qet/qet_tb_generator");
 	}
 	
 #endif