[REVIEW] Only bind mount image if presetn

Author: alexgg

automation/include/balena-deploy.inc

@@ -343,6 +343,7 @@ balena_deploy_block() {
 	local _esr="${11}"
 	local _discontinued
 	local _api_env=$(balena_lib_environment)
+	local _image_bind
 
 	[ -z "${_device_type}" ] && echo "Device type is required" && return
 	_discontinued=$(balena_lib_get_dt_state "${_device_type}")
@@ -354,6 +355,7 @@ balena_deploy_block() {
 	[ -z "${_appName}" ] && echo "App name is required" && return
 	if [ -f "${_image_path}" ]; then
 		_image_path="$(readlink --canonicalize "${_image_path}")"
+		_image_bind="-v ${_image_path}:/host/appimage.docker"
 	fi
 	_esr=${_esr:-"${ESR}"}
 
@@ -387,7 +389,7 @@ balena_deploy_block() {
 		-e balenaCloudEmail="${_balenaCloudEmail}" \
 		-e balenaCloudPassword="${_balenaCloudPassword}" \
 		-e ESR="${_esr}" \
-		-v "${_image_path}":/host/appimage.docker \
+		${_image_bind} \
 		-v "${device_dir}":/work \
 		-v "${_work_dir}":/deploy \
 		--privileged \