Support getting entities by exact name/title match

telethon/session.py

@@ -438,13 +438,19 @@ class Session:
                           (phone,))
             else:
                 username, _ = utils.parse_username(key)
-                c.execute('select id, hash from entities where username=?',
-                          (username,))
+                if username:
+                    c.execute('select id, hash from entities where username=?',
+                              (username,))
 
         if isinstance(key, int):
             c.execute('select id, hash from entities where id=?', (key,))
 
         result = c.fetchone()
+        if not result and isinstance(key, str):
+            # Try exact match by name if phone/username failed
+            c.execute('select id, hash from entities where name=?', (key,))
+            result = c.fetchone()
+
         c.close()
         if result:
             i, h = result  # unpack resulting tuple