Rangi e596dbfc80 Make failed macro arg expansions non-fatal ...

Expanding empty strings is valid but pointless;
macro args already skipped doing so, now other
`beginExpansion` calls do too.

This also fixes failed interpolations (which were
already non-fatal) to continue reading characters,
not evaluate to their initial '{' character.

2021-04-22 09:59:02 +02:00

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