Got rid with strict username existance check.

Now users w/o username should handled OK.

.gitignore

@@ -8,3 +8,4 @@ code.png
 *.swp
 *.swo
 *.allah
+.vscode/settings.json

worker.py

@@ -170,7 +170,10 @@ class MessageWorker:
             return False
         try:
             text = msg['message']['text']
-            username = msg['message']['from']['username']
+            try:
+                username = msg['message']['from']['username']
+            except:
+                username = "_null"
             try:
                 last_name = msg['message']['from']['last_name']
             except: