Rev4382, Fix is_prev_builtin startup error

src/Config.py

@@ -13,7 +13,7 @@ class Config(object):
 
     def __init__(self, argv):
         self.version = "0.7.1"
-        self.rev = 4381
+        self.rev = 4382
         self.argv = argv
         self.action = None
         self.test_parser = None

src/Debug/Debug.py

@@ -29,6 +29,8 @@ def formatTraceback(items, limit=None, fold_builtin=True):
     back = []
     i = 0
     prev_file_title = ""
+    is_prev_builtin = False
+
     for path, line in items:
         i += 1
         is_last = i == len(items)