[stable-2.10] Improve error message when ssh client is not found on the host (#70122) (#70386)

* Add changlelog
(cherry picked from commit 70bb2b33ca)

Co-authored-by: Mykola Grygoriev <nickgryg@gmail.com>

Co-authored-by: Mykola Grygoriev <nickgryg@gmail.com>

changelogs/fragments/70122-improve-error-message-ssh-client-is-not-found.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - SSH plugin - Improve error message when ssh client is not found on the host

lib/ansible/plugins/connection/ssh.py

@@ -818,12 +818,17 @@ class Connection(ConnectionBase):
                 p = None
 
         if not p:
-            if PY3 and conn_password:
+            try:
-                # pylint: disable=unexpected-keyword-arg
+                if PY3 and conn_password:
-                p = subprocess.Popen(cmd, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, pass_fds=self.sshpass_pipe)
+                    # pylint: disable=unexpected-keyword-arg
-            else:
+                    p = subprocess.Popen(cmd, stdin=subprocess.PIPE, stdout=subprocess.PIPE,
-                p = subprocess.Popen(cmd, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+                                         stderr=subprocess.PIPE, pass_fds=self.sshpass_pipe)
-            stdin = p.stdin
+                else:
+                    p = subprocess.Popen(cmd, stdin=subprocess.PIPE, stdout=subprocess.PIPE,
+                                         stderr=subprocess.PIPE)
+                stdin = p.stdin
+            except (OSError, IOError) as e:
+                raise AnsibleError('Unable to execute ssh command line on a controller due to: %s' % to_native(e))
 
         # If we are using SSH password authentication, write the password into
         # the pipe we opened in _build_command.