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[bugfix] Return gracefully from pwb.find_alternates if a folder does not exits

Bug: T308910
Change-Id: I452ecfd74145e2fc7beed56a5886555994995db2
---
M pwb.py
1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/pwb.py b/pwb.py
index 3c46597..e7a35af 100755
--- a/pwb.py
+++ b/pwb.py
@@ -291,7 +291,7 @@
 
 def find_alternates(filename, script_paths):
     """Search for similar filenames in the given script paths."""
-    from pywikibot import config, input_choice, info
+    from pywikibot import config, input_choice, error, info, warning
     from pywikibot.bot import QuitKeyboardInterrupt, ShowingListOption
 
     assert config.pwb_close_matches > 0, \
@@ -299,14 +299,17 @@
     assert 0.0 < config.pwb_cut_off < 1.0, \
         'config.pwb_cut_off must be a float in range [0, 1]'
 
-    print('ERROR: {} not found! Misspelling?'.format(filename),
-          file=sys.stderr)
+    error('{} not found! Misspelling?'.format(filename))
 
     scripts = {}
 
     script_paths = [['.']] + script_paths  # add current directory
     for path in script_paths:
         folder = Path(_pwb_dir).joinpath(*path)
+        if not folder.exists():
+            warning('{} does not exists; remove it from user_script_paths'
+                    .format(folder))
+            continue
         for script_name in folder.iterdir():
             name, suffix = script_name.stem, script_name.suffix
             if suffix == '.py' and not name.startswith('__'):

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