An applet with Popt and GUSI preferences but without alis resource

didn't work, because the resource file chain was incomplete when we
tried to open the preference file. Fixed.

Mac/Python/macgetpath.c

@@ -217,6 +217,7 @@ PyMac_GetPythonDir()
     /* First look for an override in the application file */
     UseResFile(PyMac_AppRefNum);
     handle = (AliasHandle)Get1Resource('alis', PYTHONHOMEOVERRIDE_ID);
+    UseResFile(oldrh);
     if ( handle != NULL ) {
     	homerh = PyMac_AppRefNum;
     } else {