create_readonly_postgres_user: now more robust against certain weird outputs from psql

utils.sh

@@ -315,7 +315,7 @@ function create_readonly_postgres_user() {
         || { display_error "Error creating the $RUSER_NAME role and granting SELECT on pg_authid."; return 1; }
     
     # get the list of roles
-    ROLES="$( PGPASSWORD="$PG_PASS" psql -h "$PG_HOST" -U "$PG_USER" -Aqt -c '\dg' postgres | grep '|' | cut -d '|' -f 1 )" \
+    ROLES="$( PGPASSWORD="$PG_PASS" psql -h "$PG_HOST" -U "$PG_USER" -qt -c '\dg' postgres | grep '|' | cut -d '|' -f 1 | tr -d ' ' | egrep -v '^$' )" \
         || { display_error "Error getting list of roles"; return 2; }
     
     # and for each role