Merge pull request 'fix: add handling len(pkgs) == 0' (#48) from Maks1mS/ALR:fix/handle-notfound-package into master

Reviewed-on: #48

upgrade.go

@@ -152,6 +152,10 @@ func checkForUpdates(
 				return nil, err
 			}
 
+			if len(pkgs) == 0 {
+				continue
+			}
+
 			pkg := pkgs[0]
 
 			repoVer := pkg.Version