fix build break

files/build_templates/sonic_debian_extension.j2

@@ -147,6 +147,7 @@ fi
 sudo LANG=C chroot $FILESYSTEM_ROOT depmod -a {{kversion}}
 
 ## download all dependency packages for platform debian packages
+{% if lazy_installer_debs.strip() -%}
 {% for file in lazy_installer_debs.strip().split(' ') -%}
 
 {% set dev = file.split('@')[0] -%}
@@ -165,6 +166,7 @@ done
 sudo dpkg --root=$FILESYSTEM_ROOT -P {{ debname }}
 
 {% endfor %}
+{% endif %}
 
 sudo rm -f $FILESYSTEM_ROOT/usr/sbin/policy-rc.d
 

slave.mk

@@ -286,7 +286,7 @@ $(DOCKER_LOAD_TARGETS) : $(TARGET_PATH)/%.gz-load : .platform docker-start $$(TA
 ###############################################################################
 
 # targets for building installers with base image
-$(addprefix $(TARGET_PATH)/, $(SONIC_INSTALLERS)) : $(TARGET_PATH)/% : .platform onie-image.conf $$(addprefix $(DEBS_PATH)/,$$($$*_DEPENDS)) $(addprefix $(DEBS_PATH)/,$(INITRAMFS_TOOLS) $(LINUX_KERNEL) $(IGB_DRIVER) $(SONIC_CONFIG_ENGINE) $(SONIC_DEVICE_DATA) $(SONIC_UTILS)) $$(addprefix $(TARGET_PATH)/,$$($$*_DOCKERS))
+$(addprefix $(TARGET_PATH)/, $(SONIC_INSTALLERS)) : $(TARGET_PATH)/% : .platform onie-image.conf $$(addprefix $(DEBS_PATH)/,$$($$*_DEPENDS)) $$(addprefix $(DEBS_PATH)/,$$($$*_INSTALLS)) $(addprefix $(DEBS_PATH)/,$(INITRAMFS_TOOLS) $(LINUX_KERNEL) $(IGB_DRIVER) $(SONIC_CONFIG_ENGINE) $(SONIC_DEVICE_DATA) $(SONIC_UTILS)) $$(addprefix $(TARGET_PATH)/,$$($$*_DOCKERS))
 	$(HEADER)
 	## Pass initramfs and linux kernel explicitly. They are used for all platforms
 	export initramfs_tools="$(DEBS_PATH)/$(INITRAMFS_TOOLS)"