Merge branch '5127-detect-5xx-server-error' into 'master'

fix _echo

See merge request !8

inc_functions.sh

@@ -52,7 +52,7 @@
   # echo if there is an interactive shell
   # params  string(s)  message to log
   function _echo(){
-    test $isInteractiveShell && echo "$*"
+    test "$isInteractiveShell" = "true" && echo "$*"
   }
 
 # ======================================================================