e2e: fixture skips empty folders

tests/imap_fixture.py

@@ -94,9 +94,12 @@ def inspect(user, password):
         boxes.append(m.group(3).decode())
     out = {"boxes": boxes, "folders": {}}
     for b in boxes:
-        typ, _ = c.select(f'"{b}"', readonly=True)
+        typ, count = c.select(f'"{b}"', readonly=True)
         if typ != "OK":
             continue
+        if int(count[0]) == 0:  # Dovecot answers FETCH 1:* on an empty box with BAD
+            out["folders"][b] = []
+            continue
         typ, data = c.fetch("1:*", "(FLAGS INTERNALDATE RFC822.SIZE BODY.PEEK[HEADER.FIELDS (MESSAGE-ID SUBJECT)])")
         msgs = []
         for item in data: