fixed issue 1725:No debugging under WingIDE, thanks Joe

VERSION

@@ -1 +1 @@
-Version 2.7.4-stable+timestamp.2013.10.16.09.02.18
+Version 2.7.4-stable+timestamp.2013.10.16.09.08.27

gluon/widget.py

@@ -1269,16 +1269,19 @@ end tell
     py2exe_getline = linecache.getline
     def getline(filename, lineno, *args, **kwargs):
         line = py2exe_getline(filename, lineno, *args, **kwargs)
-        if not line:                
+        if not line:
-            f = open(filename, "r")
             try:
-                for i, line in enumerate(f):
+                f = open(filename, "r")
-                    if lineno == i + 1:
+                try:
-                        break
+                    for i, line in enumerate(f):
-                else:
+                        if lineno == i + 1:
-                    line = None
+                            break
-            finally:
+                    else:
-                f.close()
+                        line = None
+                finally:
+                    f.close()
+            except (IOError, OSError):
+                line = None
         return line
     linecache.getline = getline