Fix Filters.regex failing in case the value is None

delivrance · delivrance · commit 5b94c340c072 · 2020-05-16T14:40:22.000+02:00
diff --git a/pyrogram/client/filters/filters.py b/pyrogram/client/filters/filters.py
@@ -323,7 +323,8 @@ def func(flt, update):
             else:
                 raise ValueError("Regex filter doesn't work with {}".format(type(update)))
 
-            update.matches = list(flt.p.finditer(value)) or None
+            if value:
+                update.matches = list(flt.p.finditer(value)) or None
 
             return bool(update.matches)
 
