[meld] Fix sourceview-specific preference sensitivity (closes bgo#612144)

[Kai Willadsen <kaiw src gnome org>]

commit 6d8ed4bf16858309757333a3e681130866284dea
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Fri Jun 25 15:38:43 2010 +1000

    Fix sourceview-specific preference sensitivity (closes bgo#612144)
    
    Previous changes to make sourceviewer.nullsourceview a no-op API broke
    our check for the presence of a sourceviewer module. This commit fixes
    this by checking to see whether the sourceviewer in use is actually
    backed by an imported module.

 meld/preferences.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/meld/preferences.py b/meld/preferences.py
index bc32feb..3652b09 100644
--- a/meld/preferences.py
+++ b/meld/preferences.py
@@ -131,7 +131,7 @@ class PreferencesDialog(gnomeglade.Component):
             self.fontpicker.set_font_name(self.prefs.custom_font)
         self.fontpicker.set_font_name( self.prefs.custom_font )
         self.spinbutton_tabsize.set_value( self.prefs.tab_size )
-        if srcviewer:
+        if srcviewer.gsv is not None:
             self.checkbutton_spaces_instead_of_tabs.set_active( self.prefs.spaces_instead_of_tabs )
             self.checkbutton_show_line_numbers.set_active( self.prefs.show_line_numbers )
             self.checkbutton_use_syntax_highlighting.set_active( self.prefs.use_syntax_highlighting )