Refactor CRAN link check condition for improved clarity and handling of empty values

Author: OllyButters

.github/workflows/build_packages_info.yml

@@ -134,7 +134,10 @@ jobs:
 
             ##### CRAN info
             echo "CRAN information"
-            if [[ -z "${cran_link}" || $cran_link == " "]]; then
+            if [[ -z "${cran_link}" ]]; then
+              cran_version=""
+              cran_license=""
+            elif [[ "${cran_link}" == " " ]]; then
               cran_version=""
               cran_license=""
             else