Empty options array is not parsed correctly #1715

    option (mo_rep_msg) = {
        rep_value: [ ]
    };

Error: illegal value ']' (tests/data/options_test.proto, line 82)
    at illegal (/Users/jason/src/protobuf.js/src/parse.js:96:16)
    at readValue (/Users/jason/src/protobuf.js/src/parse.js:135:19)
    at parseOptionValue (/Users/jason/src/protobuf.js/src/parse.js:614:45)
    at parseOption (/Users/jason/src/protobuf.js/src/parse.js:585:27)
    at parseCommon (/Users/jason/src/protobuf.js/src/parse.js:256:17)
    at parseType_block (/Users/jason/src/protobuf.js/src/parse.js:309:17)
    at ifBlock (/Users/jason/src/protobuf.js/src/parse.js:290:17)
    at parseType (/Users/jason/src/protobuf.js/src/parse.js:308:9)
    at parseCommon (/Users/jason/src/protobuf.js/src/parse.js:261:17)
    at parse (/Users/jason/src/protobuf.js/src/parse.js:807:21)