prevent scenario window to open if study is not saved

src/View/MainWindow.py

@@ -1206,6 +1206,31 @@ class ApplicationWindow(QMainWindow, ListedSubWindow, WindowToolKit):
         Returns:
             Nothing
         """
+        if self._study is None:
+            return
+        if self._study.filename is None or self._study.filename == "":
+            self.message_box(
+                window_title=self._trad["Warning"],
+                text=self._trad["mb_unsaved_study_title"],
+                informative_text=self._trad["mb_unsaved_studyh_msg"]
+            )
+
+            options = QFileDialog.Options()
+            options |= QFileDialog.DontUseNativeDialog
+
+            file_name, _ = QFileDialog.getSaveFileName(
+                self, "Save File",
+                "", "Pamhyr(*.pamhyr)",
+                options=options,
+            )
+            if file_name is None or file_name == "":
+                return
+
+            if file_name.rsplit(".", 1)[-1] == "pamhyr":
+                self._study.filename = file_name
+            else:
+                self._study.filename = file_name + ".pamhyr"
+
         if self._study is not None:
             if self.sub_window_exists(
                 ScenariosWindow,