fix: interrupt during disconnected phase

Because the `time.sleep` during the disconnect phase, the signal
handling is thrown off and a new bot is spawned before the `bot.hasquit`
flag can be checked. Add a check at the top of the loop to see if the
`hasquit` flag was set during a disconnect.

Fixes #1478

sopel/__init__.py

@@ -71,7 +71,12 @@ def signal_handler(sig, frame):
         if sig == signal.SIGUSR1 or sig == signal.SIGTERM or sig == signal.SIGINT:
             stderr('Got quit signal, shutting down.')
             p.quit('Closing')
+
+    # Define empty variable `p` for bot
+    p = None
     while True:
+        if p and p.hasquit:  # Check if `hasquit` was set for bot during disconnected phase
+            break
         try:
             p = bot.Sopel(config, daemon=daemon)
             if hasattr(signal, 'SIGUSR1'):