fix wrong replacement

src/gajim.py

@@ -920,7 +920,7 @@ class Interface:
 		self.sth_at_sth_dot_sth_re = sre.compile(r'\S+@\S+\.\S*[^\s)?]')
 
 	def on_launch_browser_mailer(self, widget, url, kind):
-		helpers.launch_browser_mailer(kind, url)
+		helpers.launch_browser_mailer(kind, url.decode('utf-8'))
 
 	def init_regexp(self):
 		#initialize emoticons dictionary

src/gajim_themes_window.py

@@ -80,6 +80,7 @@ class GajimThemesWindow:
 		model = self.themes_tree.get_model()
 		iter = model.get_iter_from_string(row)
 		old_name = model.get_value(iter, 0).decode('utf-8')
+		new_name = new_name.decode('utf-8')
 		if old_name == new_name:
 			return
 		if new_name in gajim.config.get_per('themes'):

src/roster_window.py

@@ -184,12 +184,10 @@ class RosterWindow:
 			if model.iter_n_children(parent_i) == 0:
 				model.remove(parent_i)
 				# We need to check all contacts, even offline contacts
-				group_empty = True
 				for jid in gajim.contacts[account]:
 					if group in gajim.contacts[account][jid][0].groups:
-						group_empty = False
 						break
-				if group_empty:
+				else:
 					del gajim.groups[account][group]
 
 	def get_appropriate_state_images(self, jid):
@@ -2002,10 +2000,10 @@ _('If "%s" accepts this request you will know his status.') %jid)
 			model.remove(iter_group_source)
 		#delete the group if it is empty (need to look for offline users too)
 		for jid in gajim.contacts[account]:
-			if group in gajim.contacts[account][jid][0].groups:
+			if grp_source in gajim.contacts[account][jid][0].groups:
 				break
 		else:
-			del gajim.groups[account][group]
+			del gajim.groups[account][grp_source]
 		if not grp_dest in u.groups:
 			u.groups.append(grp_dest)
 			self.add_contact_to_roster(data, account)