move guard clause out of context block

src/q3rcon_tui/tui.py

@@ -51,14 +51,15 @@ class RconApp(App):
         if not settings.append:
             self.query_one('#response', RichLog).clear()
 
-        try:
-            async with Client(
-                settings.host, settings.port, settings.password
-            ) as client:
         cmd = self.query_one('#command', Input).value.strip()
         if not cmd:
             self.app.bell()
             return
+
+        try:
+            async with Client(
+                settings.host, settings.port, settings.password
+            ) as client:
                 response = await client.send_command(cmd)
                 self.query_one('#response', RichLog).write(
                     self.writable.parse(cmd, response)