Don't save demo repos to config file.

Kai Reinhard

25.12.2019 bfcca792614918253ef1f1769c6a0e909eaa2638

 borgbutler-core/src/main/java/de/micromata/borgbutler/cache/ButlerCache.java

@@ -93,7 +93,7 @@
     */
    public List<Repository> getAllRepositories() {
        List<Repository> repositories = new ArrayList<>();
        for (BorgRepoConfig repoConfig : ConfigurationHandler.getConfiguration().getRepoConfigs()) {
        for (BorgRepoConfig repoConfig : ConfigurationHandler.getConfiguration().getAllRepoConfigs()) {
            if (repoConfig == null) {
                // Occurs sometimes for demo repos.
                continue;