claudia.py: Use dbus.mainloop.glib when dbus.mainloop.pyqt5 is not available

See also commit c146ff90ef

src/claudia.py

@@ -48,10 +48,15 @@ from shared_settings import *
 
 try:
     import dbus
-    from dbus.mainloop.pyqt5 import DBusQtMainLoop
+    from dbus.mainloop.pyqt5 import DBusMainLoop
     haveDBus = True
 except:
-    haveDBus = False
+    try:
+        # Try falling back to GMainLoop
+        from dbus.mainloop.glib import DBusGMainLoop as DBusMainLoop
+        haveDBus = True
+    except:
+        haveDBus = False
 
 # ------------------------------------------------------------------------------------------------------------
 # Try Import OpenGL
@@ -2748,7 +2753,7 @@ if __name__ == '__main__':
             "DBus is not available, Claudia cannot start without it!"))
         sys.exit(1)
 
-    gDBus.loop = DBusQtMainLoop(set_as_default=True)
+    gDBus.loop = DBusMainLoop(set_as_default=True)
     gDBus.bus  = dbus.SessionBus(mainloop=gDBus.loop)
     gDBus.jack = gDBus.bus.get_object("org.jackaudio.service", "/org/jackaudio/Controller")
     gDBus.ladish_control = gDBus.bus.get_object("org.ladish", "/org/ladish/Control")