Avoid panic on empty lines

Author: matteosuppo

repos.go

@@ -230,7 +230,7 @@ func RemoveRepository(repo *Repository, configFolderPath string) error {
 	for scanner.Scan() {
 		line := scanner.Text()
 		r := parseAPTConfigLine(line)
-		if r.Equals(repo) {
+		if r!= nil && r.Equals(repo) {
 			// Filter repo configs that match the repo to be removed
 			continue
 		}