Added more descriptive error if wallet cannot be loaded

electrum

@@ -178,8 +178,8 @@ if __name__ == '__main__':
             found = wallet.file_exists
             if not found:
                 found = gui.restore_or_create()
-        except SystemExit, e:
+        except IOError:
-            exit(e)
+            exit("Error retrieving wallet file.")
         except BaseException, e:
             import traceback
             traceback.print_exc(file=sys.stdout)