Catch some of the exceptions that can happen when failing to connect to target host.

multiball/fabtools.py

@@ -5,8 +5,14 @@ from tqdm import tqdm
 
 from fabric2 import ThreadingGroup, SerialGroup, Config, Connection
 
+import paramiko
+
+
 def thread_run(connection, command, result_lock, result_queue):
-    res = connection.run(command, warn=True, hide=True)
+    try:
+        res = connection.run(command, warn=True, hide=True)
+    except (paramiko.ssh_exception.NoValidConnectionsError, paramiko.ssh_exception.SSHException) as inst:
+        res = f"Could not connect to host: {inst}"
     with result_lock:
         result_queue.append((connection, res))