kitty shell prompt: fallback to plain ascii prompt in case of unicode errors

kitty/shell.py

@@ -154,8 +154,11 @@ def real_main(global_opts):
     print('Use {} for assistance or {} to quit'.format(green('help'), green('exit')))
 
     while True:
+        try:
             try:
                 cmdline = input('🐱 ')
+            except UnicodeEncodeError:
+                cmdline = input('kitty> ')
         except EOFError:
             break
         except KeyboardInterrupt: