Construct package info appropriately

Author: aashish24

CMakeLists.txt

@@ -611,7 +611,12 @@ foreach(package ${external_packages})
 
   if(CDAT_BUILD_${uc_package})
       message("[INFO] Package --- ${package}/${uc_package}/${${uc_package}_VERSION} --- will be built")
-    list(APPEND packages_info "${package} ${${uc_package}_VERSION} ${${uc_package}_SOURCE} ${${uc_package}_MD5}\n")
+    list(APPEND packages_info "${package} ${${uc_package}_VERSION} ${${uc_package}_SOURCE} ")
+    if (${uc_package}_MD5)
+      list(APPEND packages_info "${${uc_package}_MD5}\n")
+    else()
+      list(APPEND packages_info "${${uc_package}_BRANCH}\n")
+    endif()
     include("${lc_package}_external")
   endif()
 endforeach()