#3573: idle now doesn't hungs if launched as: idle -e <directory>

Patch by Guilherme Polo.

Lib/idlelib/PyShell.py

@@ -1403,8 +1403,10 @@ def main():
 
     if enable_edit:
         if not (cmd or script):
-            for filename in args:
-                flist.open(filename)
+            for filename in args[:]:
+                if flist.open(filename) is None:
+                    # filename is a directory actually, disconsider it
+                    args.remove(filename)
             if not args:
                 flist.new()
     if enable_shell: