zjsunit: Improve errors for non-invoked templates.
zjsunit: Improve errors for non-invoked templates.

zulip/zulip,kou/zulip,zulip/zulip,eeshangarg/zulip,punchagan/zulip,kou/zulip,zulip/zulip,kou/zulip,zulip/zulip,andersk/zulip,rht/zulip,hackerkid/zulip,punchagan/zulip,hackerkid/zulip,eeshangarg/zulip,hackerkid/zulip,hackerkid/zulip,punchagan/zulip,zulip/zulip,andersk/zulip,kou/zulip,andersk/zulip,hackerkid/zulip,rht/zulip,hackerkid/zulip,rht/zulip,andersk/zulip,andersk/zulip,kou/zulip,zulip/zulip,eeshangarg/zulip,kou/zulip,eeshangarg/zulip,punchagan/zulip,zulip/zulip,punchagan/zulip,rht/zulip,andersk/zulip,eeshangarg/zulip,eeshangarg/zulip,eeshangarg/zulip,punchagan/zulip,rht/zulip,kou/zulip,rht/zulip,hackerkid/zulip,andersk/zulip,rht/zulip,punchagan/zulip