Fix some errors with pylint

wo/cli/plugins/site.py

@@ -1051,6 +1051,7 @@ class WOSiteUpdateController(CementBaseController):
             if not WOService.reload_service(self, 'nginx'):
                 Log.error(self, "service nginx reload failed. "
                           "check issues with `nginx -t` command")
+            return 0
 
         if (pargs.ngxblocker and not (pargs.html or
                                       pargs.php or pargs.php73 or
@@ -1060,11 +1061,14 @@ class WOSiteUpdateController(CementBaseController):
                                       pargs.wpsubdir or pargs.wpsubdomain or
                                       pargs.hsts)):
             if pargs.ngxblocker == "on":
-                try:
-                    setupngxblocker(self, wo_domain)
-                except SiteError as e:
-                    Log.debug(self, str(e))
-                    Log.info(self, "\nngxblocker not enabled.")
+                if os.path.isdir('/etc/nginx/bots.d'):
+                    try:
+                        setupngxblocker(self, wo_domain)
+                    except SiteError as e:
+                        Log.debug(self, str(e))
+                        Log.info(self, "\nngxblocker not enabled.")
+                else:
+                    Log.error(self, 'ngxblocker stack is not installed')
             elif pargs.ngxblocker == "off":
                 if os.path.isfile(
                     '/var/www/{0}/conf/nginx/ngxblocker.conf'
@@ -1082,6 +1086,7 @@ class WOSiteUpdateController(CementBaseController):
             if not WOService.reload_service(self, 'nginx'):
                 Log.error(self, "service nginx reload failed. "
                           "check issues with `nginx -t` command")
+            return 0
 
         if ((stype == 'php' and
              oldsitetype not in ['html', 'proxy', 'php73']) or

wo/cli/plugins/site_functions.py

@@ -17,7 +17,8 @@ from wo.core.aptget import WOAptGet
 from wo.core.fileutils import WOFileUtils
 from wo.core.git import WOGit
 from wo.core.logging import Log
-from wo.core.mysql import WOMysql
+from wo.core.mysql import (MySQLConnectionError, StatementExcecutionError,
+                           WOMysql)
 from wo.core.services import WOService
 from wo.core.shellexec import CommandExecutionError, WOShellExec
 from wo.core.sslutils import SSL
@@ -1622,4 +1623,4 @@ def setupngxblocker(self, domain, block=True):
                 self, '/var/www/{0}/conf/nginx/ngxblocker.disabled'
                 .format(domain), '/var/www/{0}/conf/nginx/ngxblocker'
                 .format(domain))
-        return 0
+        return 0