Ignore empty string

bot.py

@@ -135,9 +135,12 @@ def find_uids(forum: int, s: str) -> list | None:
     people = db.read(str(forum) + ".people")
     if people is None:
         return None
-    if s[0] == "@":
-        s = s[1:]
-    f = [i for i in people.keys() if len([j for j in people[i].values() if s in j]) > 0]
+    if len(s) > 0:
+        if s[0] == "@":
+            s = s[1:]
+        f = [i for i in people.keys() if len([j for j in people[i].values() if s in j]) > 0]
+    else:
+        f = list(people.keys())
     if len(f) == 0:
         return None
     return f