Added error message if no commands could be found in func_whereis()

Otherwise the problem is not obvious in the logs.

Ticket: none
Changelog: none

Author: craigcomstock

build-scripts/functions

@@ -578,6 +578,7 @@ func_whereis() {
         # Command $1 not found, search for next argument
         shift
     done
+    log_error "Could not find any of commands $@"
     return 1
 }