GroovyTranslator doesn't handle empty maps

gremlin> identity = new OneArgLambda('it.get()', 'gremlin-groovy')
==>lambda[it.get()]
gremlin> bytecode = __.inject([:]).map(identity).asAdmin().getBytecode()
==>[[], [inject({}), map(lambda[it.get()])]]
gremlin> client.submit(bytecode).all().get()
org.apache.tinkerpop.gremlin.driver.exception.ResponseException: org.codehaus.groovy.control.MultipleCompilationErrorsException: 
Script9.groovy: 1: expecting ')', found ']' @ line 1, column 31.
gremlinscriptengine__g.inject(]).map({it.get()})
^

1 error