MainWindow: Display message when there are no current reach.

src/View/MainWindow.py

@@ -289,6 +289,11 @@ class ApplicationWindow(QMainWindow, ListedSubWindow, WindowToolKit):
     # SUBWINDOW #
     #############
 
+    def msg_select_reach(self):
+        self.message_box("Please select a reach",
+                         "Geometry edition need a reach selected "
+                         "into river network window to work on it")
+
     def open_configure(self):
         """Open configure window
 
@@ -371,9 +376,7 @@ class ApplicationWindow(QMainWindow, ListedSubWindow, WindowToolKit):
             geometry = GeometryWindow(model=self.model, parent=self)
             geometry.show()
         else:
-            self.message_box("Please select a reach",
+            self.msg_select_reach()
-                             "Geometry edition need a reach selected "
-                             "into river network window to work on it")
 
     def open_boundary_cond(self):
         bound = BoundaryConditionWindow(study = self.model, parent = self)
@@ -392,11 +395,15 @@ class ApplicationWindow(QMainWindow, ListedSubWindow, WindowToolKit):
         strick.show()
 
     def open_sections(self):
-        sections = SectionsWindow(
+        if (self.model is not None and
-            study = self.model,
+            self.model.river.has_current_reach()):
-            parent = self
+            sections = SectionsWindow(
-        )
+                study = self.model,
-        sections.show()
+                parent = self
+            )
+            sections.show()
+        else:
+            self.msg_select_reach()
 
     def open_initial_conditions(self):
         if self.model.river.has_current_reach():
@@ -405,6 +412,8 @@ class ApplicationWindow(QMainWindow, ListedSubWindow, WindowToolKit):
                 parent = self
             )
             initial.show()
+        else:
+            self.msg_select_reach()
 
     def open_solver_parameters(self):
         params = SolverParametersWindow(