Add a catch-all render 'helper' with a default keyword argument

[robinsax]

Current behaviour:

When no helper matches {{some_variable}} in a template, the output HTML contains the input string; {{some_variable}}

Expected behaviour:

When no helper matches {{some_variable}} in a template, the output HTML contains an empty string in its place. Template variables should universally support a default keyword argument, such that {{helperless_variable default="default value"}} outputs default value.

[hlainchb]

The way it works now is without the default= part. So, {{helperless "default value"}}.

[robinsax]

Ah, gotcha. I'd label this issue as documentation needed then.

[hlainchb]

Agreed. :)

…

On Thu, Aug 15, 2019 at 3:05 PM Robin Saxifrage ***@***.***> wrote: Ah, gotcha. I'd label this issue as documentation needed then. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#58?email_source=notifications&email_token=AABGIP7RQANZ6VXXUQ3B6N3QEXHIZA5CNFSM4ILZFN2KYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD4NEA7Q#issuecomment-521814142>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AABGIP5W36HO43YY4RWBNPLQEXHIZANCNFSM4ILZFN2A> .

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