fix: added a check to verify the array size for smsdevices

Author: Ph0B1uS

templates/zabbix_server.conf.erb

@@ -962,7 +962,7 @@ LoadModulePath=<%= @loadmodulepath %>
 # Mandatory: no
 # Default:
 # SMSDevices=
-<% if @smsdevices -%>
+<% if @smsdevices.length > 0 -%>
 SMSDevices=<%= @smsdevices.join(',') -%><% end -%>
 <% end -%>