Review Request: 8003177: build-infra: Compare reports diff in LocaleDataMetaInfo.class

[Erik Joelsson]

Small fix for class file diff that was introduced with the changes to 
locales.

http://cr.openjdk.java.net/~erikj/8003177/webrev.01/ 
<http://cr.openjdk.java.net/%7Eerikj/8003177/webrev.01/>

Before this change, LocaleDataMetaInfo.java was generated with an extra 
space in the list of locales for CollationData.

The change prevents sed from inserting a space when the list of locales 
is empty.

/Erik