[GROOVY-8778] Cast short-hand breaks for empty map - ASF JIRA

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We support:

println Date[time:0]
def map = [time:0]
println Date[*:map]
map = [:]
println Date[*:map]

but not:

println Date[:]

This is a breaking change since we currently support printing an empty map without brackets but would require them after this change:

println [:]

would need to be:

println([:])

But we require the brackets for lists (empty and non-empty) and non-empty maps already.

links to

GitHub Pull Request #792