Fix: Prevent empty markup when site title or description is empty #1073

Job	Run time
Test twentytwentyone build script	1m 8s
Test twentynineteen build script	15s
twentytwentyfive empty file check	10s
twentythirteen empty file check	7s
twentyseventeen empty file check	11s
twentyeleven empty file check	22s
twentyfifteen empty file check	6s
twentytwelve empty file check	7s
Test twentytwenty build script	22s
twentytwentythree empty file check	7s
twentyten empty file check	5s
twentytwentytwo empty file check	5s
twentyfourteen empty file check	7s
twentysixteen empty file check	8s
twentytwentyfour empty file check	18s
twentytwenty empty file check	14s
twentynineteen empty file check	6s
twentytwentyone empty file check	22s
Create twentytwentyfour ZIP file	9s
Create twentytwentyone ZIP file	9s
Create twentyseventeen ZIP file	8s
Create twentytwentyfive ZIP file	9s
Create twentytwenty ZIP file	9s
Create twentytwentytwo ZIP file	8s
Create twentytwentythree ZIP file	8s
Create twentynineteen ZIP file	10s
Create twentyeleven ZIP file	9s
Create twentythirteen ZIP file	7s
Create twentysixteen ZIP file	10s
Create twentyfourteen ZIP file	7s
Create twentyfifteen ZIP file	11s
Create twentytwelve ZIP file	10s
Create twentyten ZIP file	9s
Slack Notifications	-1s
Failed workflow tasks	-1s
	6m 31s

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