StringIndexOutOfBoundsException in some invalid metadata requests

[dzikoysk]

Catched using status command

12:35:41.479 ERROR |  Latest exception: java.lang.StringIndexOutOfBoundsException: String index out of range: -1
        at java.lang.String.substring(String.java:1967)
        at org.panda_lang.nanomaven.metadata.MetadataService.generateSnapshotMetadata(MetadataService.java:97)
        at org.panda_lang.nanomaven.metadata.MetadataService.generateMetadata(MetadataService.java:64)
        at org.panda_lang.nanomaven.repository.DownloadController.serve(DownloadController.java:92)
        at org.panda_lang.nanomaven.repository.RepositoryController.serveOrCatch(RepositoryController.java:58)
        at org.panda_lang.nanomaven.repository.RepositoryController.serve(RepositoryController.java:46)
        at org.panda_lang.nanomaven.NanoHttpServer.serve(NanoHttpServer.java:55)
        at fi.iki.elonen.NanoHTTPD$HTTPSession.execute(NanoHTTPD.java:945)
        at fi.iki.elonen.NanoHTTPD$ClientHandler.run(NanoHTTPD.java:192)
        at java.lang.Thread.run(Thread.java:748)