Add escape as a keybinding to exit screens without saving

src/tui.py

@@ -48,6 +48,7 @@ class EditTaskScreen(Screen):
     """
     BINDINGS = [
         Binding('ctrl+s', 'save', 'Save Changes', priority=True),
+        Binding('escape', 'exit', 'Exit Without Changes', priority=True),
     ]
     def __init__(self,text):
         """
@@ -82,6 +83,9 @@ class EditTaskScreen(Screen):
         self.text.description = query.nodes[0].text
         self.dismiss(self.text)
 
+    def action_exit(self):
+        self.dismiss(None)
+
 class EditColScreen(Screen):
     """
         This is a screen used to edit the name of a task
@@ -267,6 +271,7 @@ class KanbanForm(App):
             task and the board class
             
         """
+        if task:
             icol, itask = self.get_col_task()
             self.focused.highlighted_child.children[0].update(task.summary)
             self.board.update_task(icol, itask, task)
@@ -274,6 +279,7 @@ class KanbanForm(App):
     def new_task(self, task):
         """ This function adds a new task to our board
         """
+        if task:
             icol,_ = self.get_col_task()
             self.focused.mount(ListItem(Label(task.summary)))
             self.board.add_task(icol, task)