check if decode-syseeprom succeeded first before using its output. (#21633)

check if decode-syseeprom succeeded first before using its output.

Author: hdwhdw

files/build_templates/docker_image_ctl.j2

@@ -111,7 +111,12 @@ function preStartAction()
         systemctl stop watchdog-control.service
     fi
 {%- elif docker_container_name == "snmp" %}
-    $SONIC_DB_CLI STATE_DB HSET 'DEVICE_METADATA|localhost' chassis_serial_number $(decode-syseeprom -s)
+    if decode-syseeprom -s > /dev/null 2>&1; then
+        $SONIC_DB_CLI STATE_DB HSET 'DEVICE_METADATA|localhost' chassis_serial_number $(decode-syseeprom -s)
+    else
+        echo "Cannot fetch system eeprom information. Setting chassis serial number to N/A."
+        $SONIC_DB_CLI STATE_DB HSET 'DEVICE_METADATA|localhost' chassis_serial_number "N/A"
+    fi
 {%- else %}
     : # nothing
 {%- endif %}