caddyfile: Allow block to do nothing if nothing passed to import
#7206
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Fixes #6821
Before the parser left the
{block}-token (or{blocks.key}-token) as is during parsing, if the corresponding import did not specify any block (pasting it into the import-body as a literal).After this change, the parser ignores
{block}tokens, if there is no body to replace it with.Also add two adapt-tests to pin the new behavior of
{block}and{blocks.key}respectively.