CommonInstaller: make error function not produce errors itself (sic\!) when error-ing before /data is mounted (read: ultra-early in install process

CommonInstaller

@@ -213,12 +213,14 @@ error () {
 	ui_print "${@}"
 	ui_print " !!"
 
+	if is_mounted /data; then
 		[ "${MODE}" = "MAGISK" ] && rm -rf "${MODPATH}"
 
 		recovery_cleanup
 
 		INSTALL_SUCCESS=FALSE
 		nanodroid_storelogs
+	fi
 
 	exit 1
 }