[#3124|GTKUI] Fix comparing Name str if value is None

The original fix was not correct as the strcoll function cannot
accept None only strings. This fix ensures that the value is an
empty string if None for comparison.

deluge/ui/gtkui/gtkui.py

@@ -294,8 +294,8 @@ class GtkUI(object):
         try:
             reactor.run()
         except OverflowError:
-            # Ticket 3010 reports an error that cannot replicate so catch
-            # it and ignore it to prevent spamming logs.
+            # Ticket #3010 reports an overflow error from twisted glibbase that
+            # cannot be replicated so catch it and ignore it to prevent spamming logs.
             pass
         self.shutdown()
         gtk.gdk.threads_leave()

deluge/ui/gtkui/torrentview.py

@@ -171,18 +171,17 @@ def cell_data_queue(column, cell, model, row, data):
         cell.set_property("text", str(value + 1))
 
 def str_nocase_sort(model, iter1, iter2, data):
-    """
-    Sort string column data with locale.strcoll which (allegedly)
-    uses ISO 14651.
+    """Sort string column data using ISO 14651 in lowercase.
+
+    Uses locale.strcoll which (allegedly) uses ISO 14651. Compares first
+    value with second and returns -1, 0, 1 for where it should be placed.
 
     """
-    try:
-        v1 = model[iter1][data].lower()
-        v2 = model[iter2][data].lower()
-    except AttributeError:
-        # Catch None type for value.
-        v1 = model[iter1][data]
-        v2 = model[iter2][data]
+    v1 = model[iter1][data]
+    v2 = model[iter2][data]
+    # Catch any values of None from model.
+    v1 = v1.lower() if v1 else ""
+    v2 = v2.lower() if v2 else ""
     return strcoll(v1, v2)
 
 def queue_peer_seed_sort_function(v1, v2):