epm-upgrade: return error status if there are no packages for upgrade

bin/epm-upgrade

@@ -37,8 +37,6 @@ epm_upgrade()
 			load_helper epm-removerepo
 			load_helper epm-Install
 
-			try_change_alt_repo
-			epm_addrepo "$@"
 			local installlist="$(get_task_packages $*)"
 			# hack: drop -devel packages to avoid package provided by multiple packages
 			installlist="$(estrlist reg_exclude ".*-devel .*-devel-static" "$installlist")"
@@ -46,6 +44,13 @@ epm_upgrade()
 			# install only installed packages (simulate upgrade packages)
 			installlist="$(get_only_installed_packages "$installlist")"
 			[ -n "$verbose" ] && info "Packages to upgrade: $installlist"
+			if [ -z "$installlist" ] ; then
+				warning "There is no installed packages for upgrade from task $*"
+				exit 22
+			fi
+
+			try_change_alt_repo
+			epm_addrepo "$@"
 			(pkg_names="$installlist" epm_Install) || fatal "Can't update repo"
 			epm_removerepo "$@"
 			end_change_alt_repo