Simplified script path detection

bin/blink

@@ -5,11 +5,8 @@ import sys
 
 # We need to mangle Python's import path in case blink is run directly from
 # the bin/ directory.
-try:
-    __file__
-except NameError:
-    __file__ = sys.argv[0]
-script_dir = os.path.dirname(os.path.realpath(__file__))
+script = globals().get('__file__', sys.argv[0])
+script_dir = os.path.dirname(os.path.realpath(script))
 parent_dir = os.path.dirname(script_dir)
 if os.path.basename(script_dir)=='bin' and os.path.exists(os.path.join(parent_dir, 'blink', '__init__.py')):
     # Insert the parent path just before the existing script's path. We need