Move the error perspective to the main window

No need to have a separate file for a few lines of code

po/POTFILES

@@ -12,7 +12,6 @@ tuhigui/application.py
 tuhigui/config.py
 tuhigui/drawing.py
 tuhigui/drawingperspective.py
-tuhigui/errorperspective.py
 tuhigui/setupdialog.py
 tuhigui/svg.py
 tuhigui/tuhi.py

tuhigui/errorperspective.py

@@ -1,28 +0,0 @@
-#!/usr/bin/env python3
-#
-#  This program is free software; you can redistribute it and/or modify
-#  it under the terms of the GNU General Public License as published by
-#  the Free Software Foundation; either version 2 of the License, or
-#  (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-from gi.repository import GObject, Gtk
-
-import gi
-gi.require_version("Gtk", "3.0")
-
-
-@Gtk.Template(resource_path="/org/freedesktop/TuhiGui/ui/ErrorPerspective.ui")
-class ErrorPerspective(Gtk.Box):
-    __gtype_name__ = "ErrorPerspective"
-
-    def __init__(self, *args, **kwargs):
-        super().__init__(*args, **kwargs)
-
-    @GObject.Property
-    def name(self):
-        return "error_perspective"

tuhigui/window.py

@@ -11,11 +11,10 @@
 #  GNU General Public License for more details.
 #
 
-from gi.repository import Gtk, Gio, GLib
+from gi.repository import Gtk, Gio, GLib, GObject
 
 from .setupdialog import SetupDialog
 from .drawingperspective import DrawingPerspective
-from .errorperspective import ErrorPerspective
 from .tuhi import TuhiKeteManager
 from .config import Config
 
@@ -57,6 +56,21 @@ MENU_XML = """
 """
 
 
+@Gtk.Template(resource_path="/org/freedesktop/TuhiGui/ui/ErrorPerspective.ui")
+class ErrorPerspective(Gtk.Box):
+    '''
+    The page loaded when we cannot connect to the Tuhi DBus server.
+    '''
+    __gtype_name__ = "ErrorPerspective"
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+    @GObject.Property
+    def name(self):
+        return "error_perspective"
+
+
 @Gtk.Template(resource_path='/org/freedesktop/TuhiGui/ui/MainWindow.ui')
 class MainWindow(Gtk.ApplicationWindow):
     __gtype_name__ = 'MainWindow'