debug empty branch name

create_documentation

@@ -39,6 +39,11 @@
 	    elif [ -e ".hg" ]; then
 		branch="$(hg id -b)"
 	    fi
+	    if [[ -z $branch ]]; then
+		echo "${RED}ERROR${RESET} - empty branch name"
+		ls
+		branch="none"
+	    fi
 	    dest_dir=$out_dir/$project_name/$language/$branch
 	    if [[ $? -eq 0 ]] ; then
 		echo "${YELLOW}INFO ${RESET} - Documentation generation done for $doc_dir (superproject), copy to $dest_dir"