improve the readability of get_install_remove_lists func

src/window.py

@@ -52,7 +52,7 @@ class EepmPlayGuiWindow(Adw.ApplicationWindow):
     def __init__(self, **kwargs):
         super().__init__(**kwargs)
         self.set_title("EPM PLAY")
-        self.checkboxes = None
+        self.rows = None
 
         self.reset_button.connect("clicked", lambda _: self.update_ui())
 
@@ -101,7 +101,7 @@ class EepmPlayGuiWindow(Adw.ApplicationWindow):
             self.installed_apps = installed_apps
             self.clear_choice_listbox()
 
-            self.checkboxes = {}
+            self.rows = {}
             for app in self.applications:
                 self.add_application_row(app)
 
@@ -119,7 +119,7 @@ class EepmPlayGuiWindow(Adw.ApplicationWindow):
             on_toggle=self.on_checkbox_toggled
         )
         self.choice_listbox.append(row)
-        self.checkboxes[app['name']] = row
+        self.rows[app['name']] = row
 
     def on_checkbox_toggled(self, app_name, active):
         print(f"{app_name} {'установлен' if active else 'снят'}")
@@ -196,12 +196,20 @@ class EepmPlayGuiWindow(Adw.ApplicationWindow):
             ), on_done=self.update_ui)
 
     def get_install_remove_lists(self):
-        if self.installed_apps and self.checkboxes:
-            to_install = [app_name for app_name, row in self.checkboxes.items() if row.checkbox.get_active() and app_name not in self.installed_apps]
-            to_remove = [app_name for app_name, row in self.checkboxes.items() if not row.checkbox.get_active() and app_name in self.installed_apps]
-            return to_install, to_remove
-        else:
-            return False, False
+        if not (self.installed_apps and self.rows):
+            return [], []
+
+        to_install = [
+            app_name for app_name, row in self.rows.items()
+            if row.checkbox.get_active() and app_name not in self.installed_apps
+        ]
+
+        to_remove = [
+            app_name for app_name, row in self.rows.items()
+            if not row.checkbox.get_active() and app_name in self.installed_apps
+        ]
+
+        return to_install, to_remove
 
     def build_commands(self, to_install, to_remove):
         commands = []