fix(services/webdav): Fix possible error with value loosing from config #318

Job	Run time
plan	18s
binding_java / ubuntu-latest / webdav / nextcloud	4m 51s
binding_nodejs / ubuntu-latest / webdav / nextcloud	2m 19s
core / ubuntu-latest / webdav / nextcloud	4m 8s
core / ubuntu-latest / webdav / nginx	2m 11s
core / ubuntu-latest / webdav / nginx_with_empty_password	1m 59s
binding_python / ubuntu-latest / webdav / nextcloud	3m 14s
core / ubuntu-latest / webdav / nginx_with_password	2m 5s
core / ubuntu-latest / webdav / nginx_with_redirect	2m 17s
core / ubuntu-latest / webdav / owncloud	3m 13s
	26m 35s

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