soda/docker: ACCESS_CONTEXT_ROOT with empty string is now considered valid...

soda/docker: ACCESS_CONTEXT_ROOT with empty string is now considered valid value, so uses default ('soda') only if the var not exist

docker/start-soda.sh

@@ -6,9 +6,11 @@ set -eux
 date
 env
 
-# set optional
+# set optional to defaults if:
+# :- var not exist or is empty string/null
+# -  var not exist
 ENABLE_ASYNC_UWS=${ENABLE_ASYNC_UWS:-}
-ACCESS_CONTEXT_ROOT=${ACCESS_CONTEXT_ROOT:-soda}
+ACCESS_CONTEXT_ROOT=${ACCESS_CONTEXT_ROOT-soda}
 
 OIDC_RAP_URL=${OIDC_RAP_URL:-}
 OIDC_GMS_URL=${OIDC_GMS_URL:-}