ref(helm): make repo not found error more clear

This addresses issue #563

cmd/manager/manager/expander.go

@@ -69,7 +69,7 @@ func (e *expander) getBaseURL() string {
 func (e *expander) ExpandConfiguration(conf *common.Configuration) (*ExpandedConfiguration, error) {
 	expConf, err := e.expandConfiguration(conf)
 	if err != nil {
-		return nil, fmt.Errorf("cannot expand configuration:%s\n%v\n", err, conf)
+		return nil, err
 	}
 
 	return expConf, nil

pkg/repo/inmem_repo_service.go

@@ -111,7 +111,7 @@ func (rs *inmemRepoService) GetRepoByChartURL(URL string) (IRepo, error) {
 	}
 
 	if found == nil {
-		return nil, fmt.Errorf("No repository for url %s", URL)
+		return nil, fmt.Errorf("No repository found for chart url: %s", URL)
 	}
 
 	return found, nil