Dont add the separator until there is at LEAST one item in the string.

The issue was that we were getting:
SEPERATORlabelinfoSEPERATOR
so splitting the string was giving us an empty string at the start
fixes b/6239815 Changing labels throws IllegalArgumentException: Folder de-serializing failed. Wrong number of members detected.

Change-Id: Id5ec9eb21cb088c49c46f232e882f42d8d108970
1 file changed