uiutil: Drop check for old pygobject row handling

Once upon a time it couldn't handle setting a row value to None,
but we've bumped the dep now

virtManager/manager.py

@@ -754,8 +754,6 @@ class vmmManager(vmmGObjectUI):
             row[ROW_MARKUP] = self._build_vm_markup(name, status)
 
             desc = vm.get_description()
-            if not uiutil.can_set_row_none:
-                desc = desc or ""
             row[ROW_HINT] = util.xml_escape(desc)
         except libvirt.libvirtError, e:
             if util.exception_is_libvirt_error(e, "VIR_ERR_NO_DOMAIN"):
@@ -770,8 +768,6 @@ class vmmManager(vmmGObjectUI):
             return
 
         new_icon = _get_inspection_icon_pixbuf(vm, 16, 16)
-        if not uiutil.can_set_row_none:
-            new_icon = new_icon or ""
         row[ROW_INSPECTION_OS_ICON] = new_icon
 
         self.vm_row_updated(vm)

virtManager/snapshots.py

@@ -231,9 +231,6 @@ class vmmSnapshotPage(vmmGObjectUI):
         has_internal = False
         for snap in snapshots:
             desc = snap.get_xmlobj().description
-            if not uiutil.can_set_row_none:
-                desc = desc or ""
-
             name = snap.get_name()
             state = util.xml_escape(snap.run_status())
             if snap.is_external():

virtManager/uiutil.py

@@ -21,13 +21,6 @@
 from gi.repository import GObject
 from gi.repository import Gtk
 
-try:
-    import gi
-    gi.check_version("3.7.4")
-    can_set_row_none = True
-except (ValueError, AttributeError):
-    can_set_row_none = False
-
 
 #####################
 # UI getter helpers #