Simplify code by letting run() generate exception on non zero exit status

jail2ban/pfctl.py

@@ -9,11 +9,9 @@ def pfctl_cfg_read(anchor):
     cmd = [_SUDO, _PFCTL, '-a', anchor, '-sr']
     logging.info('Running %s', cmd)
 
-    res = run(cmd, capture_output=True)
+    res = run(cmd, capture_output=True, check=True)
 
-    if res and res.stdout:
     logging.info('Result: %s', res)
-        res.check_returncode()
     return res.stdout.splitlines()
 
 
@@ -24,11 +22,10 @@ def pfctl_cfg_write(anchor, cfg):
 
     res = run(cmd,
               input=cfg,
+              check=True,
               capture_output=True)
 
-    if res:
     logging.info('Result: %s', res)
-        res.check_returncode()
     return res.stdout.splitlines()
 
 
@@ -40,9 +37,9 @@ def pfctl_table_op(anchor, **kwargs):
 
     logging.info('Running %s', cmd)
 
-    res = run([x for x in cmd if x is not None], capture_output=True)
+    res = run([x for x in cmd if x is not None],
+              capture_output=True,
+              check=True)
 
-    if res:
     logging.debug(res)
-        res.check_returncode()
     return res.stdout.splitlines()